Aniline CAS 62-53-3
Chelora Chemicals is a supplier of high-purity Aniline, shipping worldwide to isocyanate producers, rubber chemical plants, dye and pigment manufacturers and pharmaceutical intermediate houses. Every consignment leaves with a batch-specific COA and the current SDS.
Also known as: Aminobenzene · Phenylamine · Benzenamine · Aniline oil · Aminophen · Kyanol
Request a quotation
Price, lead time and a sample COA for Aniline, usually within one working day. We ship worldwide.
Request a Quote Email the DeskDocumentation
- Batch-specific COA
- Safety Data Sheet (SDS)
- Technical Data Sheet
- Dangerous-goods papers
- Certificate of origin
What is Aniline?
Aniline is the parent aromatic amine — an amino group directly attached to a benzene ring, C6H5NH2. It is one of the oldest industrial organic chemicals, and it remains one of the largest by volume. Nearly every aromatic amine in commerce traces back to it.
Attaching the nitrogen to an aromatic ring changes its character fundamentally. The lone pair delocalises into the ring, which makes aniline a far weaker base than any aliphatic amine — its conjugate acid pKa is around 4.6 against roughly 10 to 11 for a typical alkylamine. It also makes the ring itself strongly activated toward electrophilic substitution, which is the basis of most dye chemistry.
Physically it is a colourless to pale-yellow oily liquid that darkens steadily to brown on exposure to air and light. It boils at about 184 °C, freezes just below zero and is only sparingly soluble in water. The flash point near 70 °C puts it in a comfortable class for fire, but that is not where the hazard lies.
What governs how aniline is handled is its toxicology. It is readily absorbed through intact skin, and once absorbed it converts haemoglobin to methaemoglobin, which cannot carry oxygen. It also carries a carcinogenicity classification. These are not incidental warnings — they shape the design of every plant that handles it.
Commercially, the overwhelming majority of global aniline goes to one product: methylene diphenyl diisocyanate, the aromatic isocyanate behind rigid polyurethane insulation foam. Rubber chemicals, dyes, pigments, agrochemicals and pharmaceutical intermediates share the remainder.
Why aniline specifically
- The gateway to MDI. Condensed with formaldehyde and phosgenated, it gives the aromatic isocyanate that underpins the global rigid insulation foam industry. No other feedstock serves.
- A strongly activated ring. The amino group activates the ring powerfully toward electrophilic substitution, which is what makes aniline the foundation of synthetic dye chemistry.
- Diazotisable. Treated with nitrous acid it gives a diazonium salt that couples into azo dyes or is displaced to install almost any substituent on the ring.
- A weak base, deliberately. Its low basicity is useful: it can be acylated and substituted without the aggressive nucleophilic behaviour of an aliphatic amine.
How Aniline is Manufactured
Aniline is made from benzene in two steps, and one route dominates global capacity completely.
- Nitration. Benzene is nitrated with mixed acid to nitrobenzene. This step is well established and run at very large scale, usually integrated with the aniline plant downstream.
- Catalytic hydrogenation. Nitrobenzene is hydrogenated over a copper, nickel or noble metal catalyst, either in the vapour phase in a fluidised bed or in the liquid phase. The nitro group is reduced to an amine. This is the dominant route and accounts for the great majority of world capacity.
- Alternative routes. Phenol can be aminated with ammonia over a catalyst, and chlorobenzene can be reacted with ammonia under pressure. Both are minor by comparison, though phenol amination persists where phenol is cheap.
- Purification. Crude aniline is purified by distillation, usually under reduced pressure to limit discolouration. Residual nitrobenzene, cyclohexylamine from over-hydrogenation, and phenol are the traces that distinguish grades.
Typical Commercial Specification
Figures below are representative of standard commercial grade. Dye-grade and low-colour material with tighter nitrobenzene and colour limits is available — send us the specification you work to and we will quote against it.
| Parameter | Typical Value |
|---|---|
| Appearance | Colourless to pale-yellow oily liquid |
| Assay (GC) | 99.9% min |
| Nitrobenzene | 10 ppm max |
| Cyclohexylamine | 50 ppm max |
| Phenol | 50 ppm max |
| Water (Karl Fischer) | 0.1% max |
| Colour (APHA) | 20 max on fresh material |
| Freezing point | −6.0 °C min |
| Distillation range | 183 – 186 °C (95% v/v) |
| Specific gravity at 20 °C | 1.021 – 1.024 |
| Iron (Fe) | 1 ppm max |
| Non-volatile residue | 0.01% max |
Physical & Chemical Properties
| Property | Value |
|---|---|
| Molecular formula | C6H5NH2 (C6H7N) |
| Molecular weight | 93.13 g/mol |
| Appearance | Colourless to pale-yellow oily liquid, darkening to brown on exposure |
| Odour | Characteristic aromatic amine, faintly fishy |
| Melting point | approx. −6 °C |
| Boiling point | approx. 184 °C at 760 mmHg |
| Vapour pressure | approx. 0.09 kPa at 25 °C |
| Relative density | approx. 1.022 g/cm³ at 20 °C |
| Flash point | approx. 70 °C (closed cup) |
| Autoignition temperature | approx. 615 °C |
| Solubility in water | Sparingly soluble — approximately 3.6 g per 100 mL at 20 °C |
| Other solvents | Miscible with ethanol, ether, benzene and most organic solvents |
| Basicity | pKa (conjugate acid) approx. 4.6 — a very weak base |
| Skin absorption | Readily absorbed through intact skin — a primary exposure route |
| Incompatibilities | Strong oxidisers, strong acids, acid chlorides, nitrous acid, copper and its alloys |
| Decomposition products | Oxides of nitrogen, carbon monoxide, carbon dioxide |
Reactivity in practice
An activated aromatic ring and a weakly basic nitrogen. Four reaction types account for almost all commercial aniline chemistry:
- Condensation with formaldehyde. Gives methylenedianiline and the polymeric methylene dianilines, which are phosgenated to MDI — the single largest outlet by a wide margin.
- Diazotisation and coupling. With nitrous acid the amine becomes a diazonium salt, which couples with phenols and naphthols into azo dyes or is displaced to install halide, cyanide, hydroxyl and other substituents.
- Acylation and alkylation. Reaction with acid chlorides, anhydrides and alkylating agents gives the substituted anilines and anilides behind pharmaceutical, agrochemical and rubber chemistry.
- Oxidative coupling and condensation. Self-condensation gives diphenylamine; condensation with ketones and other partners gives the antioxidants and antiozonants used throughout the rubber industry.
Aniline vs Diphenylamine, MDA and the Aromatic Diamines
Aromatic amines behave quite differently from aliphatic ones, and the reason is the ring. The nitrogen lone pair is delocalised into the aromatic system, which makes these compounds far weaker bases and poorer nucleophiles than their saturated counterparts — and also gives them the toxicological profile that governs how they are regulated.
| Aromatic amine | CAS | Character & principal use |
|---|---|---|
| Aniline | 62-53-3 | The parent; weak base, oily liquid — MDI, rubber chemicals, dyes, pharmaceutical intermediates |
| Diphenylamine | 122-39-4 | Secondary diaryl amine, solid — rubber and lubricant antioxidants, propellant stabiliser |
| 4,4′-Methylenedianiline (MDA) | 101-77-9 | Diamine from aniline and formaldehyde — MDI precursor, high-temperature epoxy hardener |
| m-Phenylenediamine | 108-45-2 | Aromatic diamine — azo dyes, meta-aramid fibre, epoxy hardeners, RO membranes |
Stated plainly: aniline is a weak base because its lone pair is tied into the ring, which is why it behaves nothing like cyclohexylamine despite differing by only six hydrogens. Diphenylamine, with two rings on one nitrogen, is weaker still and works as a radical scavenger rather than as a base at all. The aromatic diamines are building blocks for isocyanates and high-temperature polymers. Across the whole class, health classification rather than chemistry is usually what decides whether a given compound can be used at all in a given market.
Industries We Supply Aniline To
The same molecule leaves our warehouse for very different factories. What changes between them is not the CAS number but the grade — nitrobenzene and colour in particular — and the documentation each sector expects.
Where Aniline is Used
One application dominates global aniline consumption, with several substantial markets behind it. These are the end uses our customers buy it for, in order of volume.
In MDI and polyurethane
This single application accounts for the great majority of world aniline consumption. Aniline is condensed with formaldehyde under acid catalysis to give a mixture of methylenedianiline and higher polymeric methylene dianilines, which is then phosgenated to polymeric MDI. That isocyanate reacts with polyols to form the rigid polyurethane foam used to insulate buildings, refrigerators, cold stores and pipework. The scale of that market is what makes aniline a bulk commodity rather than a fine chemical, and it is why aniline capacity is typically built integrated with nitrobenzene upstream and MDI downstream.
In rubber chemicals
The antidegradants that keep tyres from cracking are built on aniline. Condensing aniline derivatives gives the substituted para-phenylenediamines that scavenge ozone at the rubber surface, and condensation with acetone gives the polymerised quinoline antioxidants used for heat ageing. Between them these are among the highest-volume rubber chemicals in the world, and aniline is the common ancestor.
In dyes and pigments
Aniline is where synthetic dye chemistry began and it remains central to it. The amino group strongly activates the ring, so substitution is easy; and diazotisation converts the amine into a diazonium salt that either couples directly into an azo chromophore or is displaced to install almost any other substituent. Colour on the incoming aniline is a real specification here — the material darkens on standing, and a brown feedstock will not give a reproducible shade.
In pharmaceutical and agrochemical intermediates
Substituted anilines and anilides appear throughout both industries. Aniline is the precursor to para-aminophenol, itself the precursor to one of the most widely used analgesics in the world, and to a long list of herbicide and fungicide actives built on an anilide core. These routes run at much higher purity specifications than the MDI chain, with residual nitrobenzene the critical figure.
Need Aniline for a specific grade or volume?
Tell us the grade, the nitrobenzene and colour limits you work to and the annual quantity. We will come back with a price, a lead time and a sample COA — delivered to any port worldwide.
Quality Control & Testing
Every lot is released against a batch-specific Certificate of Analysis. The methods behind the numbers are standard across the industry, and we are happy to share them or to work to your own in-house test protocol.
- Assay and impurity profile — gas chromatography quantifying nitrobenzene, cyclohexylamine, phenol and substituted aniline traces.
- Residual nitrobenzene — a dedicated sensitive determination, reported explicitly. This is the most important single figure on an aniline certificate.
- Colour — APHA / Hazen on fresh material. Aniline darkens on air and light exposure, so colour on receipt reflects transit and storage as much as manufacture.
- Freezing point — a classical and surprisingly sensitive purity check for aniline, still widely specified.
- Water content — Karl Fischer titration, which matters in phosgenation and acylation chemistry.
- Iron and residue — both relevant to colour stability and to downstream catalyst behaviour.
Common Process Problems & Likely Causes
When aniline misbehaves in a plant, the cause is usually one of a short list of things. This table is the shortcut our technical desk works through before anyone opens a complaint file.
| Symptom | Likely cause | What to check |
|---|---|---|
| Nitrobenzene detected in a downstream product | Unconverted starting material carried through from hydrogenation | Nitrobenzene figure on the batch COA; specify a tighter grade for sensitive routes |
| Material brown on arrival | Air and light exposure in transit or storage — normal for aniline | Colour versus COA, drum opacity, nitrogen blanket; assay is usually unaffected |
| Dye shade not reproducing | Colour on the incoming aniline, or substituted aniline traces | APHA on receipt, full impurity profile, retained sample comparison |
| Unexpected strong base behaviour in a reaction | Cyclohexylamine carry-over from over-hydrogenation | Cyclohexylamine figure on the COA; it behaves nothing like aniline |
| Freezing point reading low | Water or impurity carry-over | Karl Fischer result and GC profile; freezing point is a sensitive purity check here |
| Phosgenation yield below expectation | Water content, or phenol carry-over consuming reagent | Karl Fischer result and the phenol figure on the COA |
| Operator methaemoglobin finding on health surveillance | Skin absorption — the dominant exposure route for aniline | Glove selection and change frequency, splash protection, hygiene procedures |
| Corrosion on transfer fittings | Copper, brass or bronze in contact with the amine | Materials of construction — stainless steel or lined equipment |
Packaging, Storage & Shipping
- Standard packing. 200 kg net in lined steel drums, with 1000 L IBCs for larger users.
- Bulk packing. Road tankers and ISO tank containers for MDI, rubber chemical and dye producers.
- Light and air exclusion. Aniline darkens steadily on exposure to air and light. Opaque packaging and nitrogen blanketing are standard, and are the difference between a pale and a brown delivery.
- Storage. Cool, dark, well-ventilated and bunded, with containers tightly closed. Secondary containment is a sensible default given the toxicity.
- Materials of construction. Stainless steel or suitable lined vessels. Avoid copper, brass, bronze and aluminium.
- Oxygen and light exclusion. Aromatic amines darken rapidly on exposure to air and light — a surface oxidation effect rather than bulk decomposition, but one that matters where colour is specified. Nitrogen blanketing and opaque packaging are standard.
- Shelf life. Typically 12 months in unopened original packing under those conditions. Beyond that, re-test rather than assume.
- Skin contact control. Aniline is readily absorbed through intact skin, so splash containment and transfer design matter more here than for most liquids of comparable flash point. Treat a spill as a toxic exposure event, not a housekeeping one.
- Transport classification. UN 1547, Aniline, Class 6.1 toxic, Packing Group II — shipped with full dangerous-goods documentation.
Hazards & Safe Handling
Aniline is acutely toxic, readily absorbed through the skin, causes methaemoglobinaemia and carries a carcinogenicity classification. It must be handled by trained personnel under a proper risk assessment with health surveillance. The classifications below are indicative — the current SDS supplied with your consignment is the governing document.
- Skin absorption and methaemoglobin. Aniline passes readily through intact skin, and once absorbed it converts haemoglobin to methaemoglobin, which cannot carry oxygen. The clinical sign is cyanosis — a blue-grey discolouration of the lips and extremities. This is the defining hazard of the product and it is what exposure control must be designed around.
- Health surveillance. Most jurisdictions require health surveillance for workers exposed to aniline, typically including methaemoglobin monitoring. Treat this as a design requirement rather than a compliance afterthought.
- Carcinogenicity classification. Aniline carries a carcinogenicity classification in several systems. This affects labelling, exposure control and, in some jurisdictions, substitution obligations.
- PPE. Chemical-resistant gloves with a known breakthrough time for aniline, chemical goggles and face shield, and chemical-resistant clothing. Glove material selection matters more than usual here, since the hazard is absorption rather than irritation.
- Exposure control. Handle in a closed system wherever possible. Where open handling is unavoidable, local exhaust ventilation plus full splash protection, and procedures that treat any skin contact as a reportable exposure.
- Incompatibilities. Strong oxidising agents, strong acids, acid chlorides, nitrous acid and nitrites, and copper and its alloys.
- Environment. Toxic to aquatic life. Do not allow to enter drains, surface water or groundwater. Dispose through a licensed chemical waste contractor.
- First aid. Remove contaminated clothing immediately and wash the skin thoroughly with soap and water — speed matters because absorption continues while the material is in contact. Flush eyes for at least 15 minutes. Seek medical attention urgently with the SDS to hand, and tell the clinician that methaemoglobinaemia is the expected effect.
Regulatory & Compliance Notes
Aniline is one of the most heavily regulated high-volume industrial chemicals, principally because of its toxicological profile rather than its reactivity. The notes below are orientation rather than legal advice; confirm your own position with your regulatory adviser well before importing.
- Inventory status. Listed on the principal chemical inventories in the major importing regions. Ask us for the inventory confirmation relevant to your destination country.
- Import registration. Several territories require the importer to hold a registration or notification before a consignment lands. Start that process early — it is the most common cause of delay at destination.
- Hazard communication. Supplied with an SDS compliant with the format applicable to your region, and labelled in line with the GHS classification for the product.
- Carcinogenicity classification. Aniline carries a carcinogenicity classification in several regulatory systems, with consequences for labelling, workplace exposure limits, health surveillance and in some jurisdictions substitution obligations. Build this into your assessment at the design stage.
- Occupational health surveillance. Most jurisdictions require health surveillance for exposed workers, commonly including methaemoglobin monitoring. This applies downstream as well as at the point of manufacture.
- Consumer product restrictions. Aromatic amines including aniline are restricted in a range of consumer applications, particularly textiles and articles in prolonged skin contact. Where your product reaches a consumer, confirm residual aromatic amine limits at destination.
- Dangerous goods. UN 1547, Aniline, Class 6.1 toxic, Packing Group II. Declarations prepared for IMDG (sea) or IATA (air) as appropriate to the mode.
We Supply Aniline Worldwide
Chelora Chemicals is a supplier and export partner, not a single-plant trader. We ship Aniline from India to customers across Asia, Europe, the Middle East, Africa, and North and South America, handling the export documentation, dangerous-goods paperwork and freight so the material arrives ready to use.
- Incoterms. EXW, FOB, CIF, CFR and DAP quoted to suit your purchasing terms and freight arrangements.
- Ports. Regular shipments through Nhava Sheva (JNPT) and Mundra, with other Indian ports arranged where it suits the routing.
- Documentation. Commercial invoice, packing list, certificate of origin, COA, SDS and dangerous-goods declaration issued as a complete set.
- Flexible volumes. A single drum for laboratory qualification, through LCL consolidations, up to repeat full loads on a supply contract.
- Supply continuity. Because we are independent of any one producer, a plant turnaround or a shipping disruption at one source does not have to become your stock-out.
Buying Aniline from Chelora
We are an independent sourcing and supply partner. For aniline that means matching the grade to the end use — bulk technical for the isocyanate chain, tight nitrobenzene and colour for dyes and pharmaceutical intermediates — and making sure the handling infrastructure at your end matches what this product actually requires.
- Documentation on every lot. Batch-specific COA including residual nitrobenzene, current SDS and TDS.
- Samples before commitment. Trial quantities for process qualification ahead of a commercial order.
- Quantities. From a single 200 kg drum through to repeat tank loads on contract supply.
- Export experience. Class 6.1 dangerous-goods documentation, packing and labelling handled for sea and road freight.
- Technical support. Direct access to people who know the chemistry, for questions on nitrobenzene limits, colour stability or handling design.
- Related intermediates. Diphenylamine, MDA, m-phenylenediamine, cyclohexylamine, nitroanilines and the wider aromatic range.
How ordering works
- Send the enquiry. Product, grade or specification, quantity, destination port and the Incoterm you buy on. If you have a spec sheet, attach it — it saves a round trip.
- We quote. Price, lead time, packing and a sample COA, normally within one working day.
- Sample and qualify. For first orders or critical applications, we send a trial quantity so your lab can sign off before you commit.
- Confirm the order. Proforma invoice issued; payment terms agreed against the volume and the relationship.
- Production and QC. Material allocated and released against a batch-specific COA, with a pre-shipment sample where the application calls for it.
- Ship and document. Packed, labelled and loaded with the full export and dangerous-goods document set, and tracked through to arrival.
Aniline — Common Questions
The questions our technical desk is asked most often about Aniline. If yours isn't here, call or email and you will reach someone who knows the chemistry.
What is the CAS number of Aniline?
The CAS number for Aniline is 62-53-3, and its EC number is 200-539-3. It is also listed as aminobenzene, phenylamine, benzenamine and aniline oil. The molecular formula is C6H5NH2 with a molecular weight of 93.13 g/mol.
What is aniline used for?
The great majority of world production goes to methylene diphenyl diisocyanate — aniline is condensed with formaldehyde and phosgenated to give the aromatic isocyanate behind rigid polyurethane insulation foam. The remainder goes to rubber antioxidants and antiozonants, azo dyes and pigments, pharmaceutical intermediates including analgesic chemistry, agrochemical actives, rubber accelerators and a wide range of fine chemicals.
Do you supply aniline worldwide?
Yes. Chelora Chemicals supplies and exports aniline worldwide — across Asia Pacific, Europe, the Middle East, Africa and the Americas, as well as throughout India. We quote on EXW, FOB, CIF, CFR and DAP terms, ship mainly through Nhava Sheva and Mundra, and handle the commercial invoice, packing list, certificate of origin, COA, SDS and dangerous-goods declaration as a complete document set. Note that some destinations require importer registration specific to toxic substances.
What are the hazards of handling aniline?
The defining hazard is skin absorption. Aniline passes readily through intact skin, and once absorbed it converts haemoglobin to methaemoglobin, which cannot carry oxygen — the clinical sign is cyanosis, a blue-grey discolouration of the lips and extremities. It also carries a carcinogenicity classification. The modest flash point of about 70 °C misleads people into treating it as a routine liquid; it is not. Closed transfer, properly selected gloves and treating every splash as an exposure event are what matter, alongside the health surveillance most jurisdictions require.
Why is aniline a much weaker base than cyclohexylamine?
Because of the ring. In aniline the nitrogen lone pair is delocalised into the aromatic system, so it is far less available to accept a proton — the conjugate acid pKa is around 4.6. Cyclohexylamine has the same carbon skeleton saturated, so its lone pair stays on the nitrogen and the pKa is around 10.6. That is a difference of about a millionfold in basicity between two molecules that differ by six hydrogens, and it is why they are not interchangeable in any application.
Why does residual nitrobenzene matter?
Because it is unconverted starting material rather than an exotic trace, and it carries its own severe toxicity and carcinogenicity classification. It also passes through into downstream products, which is a serious problem in anything consumer-adjacent or pharmaceutical. It should be reported explicitly on the batch certificate rather than inferred from a typical specification sheet, and it is the first figure to look at.
How is aniline manufactured?
Overwhelmingly by hydrogenating nitrobenzene. Benzene is nitrated with mixed acid to nitrobenzene, which is then hydrogenated over a copper, nickel or noble metal catalyst in either the vapour or liquid phase. Minor alternative routes aminate phenol with ammonia or react chlorobenzene with ammonia under pressure. Crude aniline is purified by distillation under reduced pressure to limit discolouration.
What purity does Chelora supply, and can you meet a tighter specification?
Standard commercial grade is 99.9% minimum assay by GC, with nitrobenzene held to 10 ppm maximum, cyclohexylamine and phenol each to 50 ppm maximum, water to 0.1% maximum and colour to 20 APHA on fresh material. Dye-grade and low-colour material with tighter limits is available — send us the specification you work to.
Why has my aniline turned brown?
Air and light. Aniline oxidises on exposure to both and darkens steadily from colourless through yellow to brown. It is a surface and bulk oxidation effect rather than decomposition, and the assay is usually little affected — but in dye and pigment work the colour carries straight through and a brown feedstock will not give a reproducible shade. Opaque packaging, nitrogen blanketing and dark storage are the standard controls, and they work.
What is MDI and why does so much aniline go into it?
Methylene diphenyl diisocyanate, made by condensing aniline with formaldehyde to give methylenedianiline and its polymeric homologues, then phosgenating. The resulting isocyanate reacts with polyols to form rigid polyurethane foam, which is the dominant insulation material for buildings, refrigerators, cold stores and pipework worldwide. The scale of that market is simply enormous relative to every other aniline use, which is why aniline is a bulk commodity and why its capacity is usually built integrated with nitrobenzene upstream and MDI downstream.
Does aniline require health surveillance for workers?
In most jurisdictions, yes. Because the dominant exposure route is skin absorption and the effect is methaemoglobin formation, health surveillance commonly includes methaemoglobin monitoring for exposed workers. The carcinogenicity classification adds further obligations in several territories. Treat this as part of the plant design rather than a compliance item to be addressed afterwards.
How is aniline classified for transport?
It ships as UN 1547, Aniline, Class 6.1 toxic, Packing Group II. We supply the full dangerous-goods documentation, packing and labelling for both sea and road freight.
Why is freezing point on the specification?
Because it is a classical and surprisingly sensitive purity test for aniline, still widely used. Pure aniline freezes at about −6 °C, and even small amounts of water or impurity depress that measurably. It costs almost nothing to run and often flags a problem before the chromatography does, which is why it has stayed on aniline specifications long after being dropped from most others.
How should aniline be stored, and what is its shelf life?
Store in a cool, dark, well-ventilated and bunded area with containers tightly closed and preferably nitrogen-blanketed, in opaque packaging. Secondary containment is a sensible default given the toxicity. Use stainless steel or suitably lined equipment and avoid copper, brass and bronze. Unopened original packing typically carries a 12-month shelf life; colour will drift before anything else does.
What packing sizes and order quantities are available?
Standard packing is 200 kg net in lined steel drums, with 1000 L IBCs for larger users and road tankers or ISO tanks for MDI, rubber chemical and dye producers. Orders run from a single drum for trial work up to repeat tank loads on contract supply.
Do you provide a COA and SDS, and can I get a sample first?
Yes to both. Every consignment ships with a batch-specific Certificate of Analysis including the residual nitrobenzene figure, the current Safety Data Sheet and a Technical Data Sheet. Trial samples for process qualification are available before you place a commercial order — request one through the contact form or email source@chelorachemicals.com.
Can aniline be substituted with another amine?
In the MDI chain, no — the polymer is defined by the monomer and there is no alternative feedstock. In dye chemistry, substituted anilines and other aromatic amines give different chromophores rather than the same one made differently. In rubber chemicals the antidegradant structures are built on aniline derivatives specifically. Where a weak aromatic base is wanted rather than aniline's particular structure, there are options — but across aniline's main markets it is the molecule rather than a property that is being bought.
Ready to source Aniline?
Send us your specification, grade and annual volume. You will get a price, a realistic lead time and a sample COA from someone who understands what the material has to do in your process — delivered anywhere in the world.
Aniline CAS 62-53-3
Chelora Chemicals is a supplier of high-purity Aniline, shipping worldwide to isocyanate producers, rubber chemical plants, dye and pigment manufacturers and pharmaceutical intermediate houses. Every consignment leaves with a batch-specific COA and the current SDS.
Also known as: Aminobenzene · Phenylamine · Benzenamine · Aniline oil · Aminophen · Kyanol
Request a quotation
Price, lead time and a sample COA for Aniline, usually within one working day. We ship worldwide.
Request a Quote Email the DeskDocumentation
- Batch-specific COA
- Safety Data Sheet (SDS)
- Technical Data Sheet
- Dangerous-goods papers
- Certificate of origin
What is Aniline?
Aniline is the parent aromatic amine — an amino group directly attached to a benzene ring, C6H5NH2. It is one of the oldest industrial organic chemicals, and it remains one of the largest by volume. Nearly every aromatic amine in commerce traces back to it.
Attaching the nitrogen to an aromatic ring changes its character fundamentally. The lone pair delocalises into the ring, which makes aniline a far weaker base than any aliphatic amine — its conjugate acid pKa is around 4.6 against roughly 10 to 11 for a typical alkylamine. It also makes the ring itself strongly activated toward electrophilic substitution, which is the basis of most dye chemistry.
Physically it is a colourless to pale-yellow oily liquid that darkens steadily to brown on exposure to air and light. It boils at about 184 °C, freezes just below zero and is only sparingly soluble in water. The flash point near 70 °C puts it in a comfortable class for fire, but that is not where the hazard lies.
What governs how aniline is handled is its toxicology. It is readily absorbed through intact skin, and once absorbed it converts haemoglobin to methaemoglobin, which cannot carry oxygen. It also carries a carcinogenicity classification. These are not incidental warnings — they shape the design of every plant that handles it.
Commercially, the overwhelming majority of global aniline goes to one product: methylene diphenyl diisocyanate, the aromatic isocyanate behind rigid polyurethane insulation foam. Rubber chemicals, dyes, pigments, agrochemicals and pharmaceutical intermediates share the remainder.
Why aniline specifically
- The gateway to MDI. Condensed with formaldehyde and phosgenated, it gives the aromatic isocyanate that underpins the global rigid insulation foam industry. No other feedstock serves.
- A strongly activated ring. The amino group activates the ring powerfully toward electrophilic substitution, which is what makes aniline the foundation of synthetic dye chemistry.
- Diazotisable. Treated with nitrous acid it gives a diazonium salt that couples into azo dyes or is displaced to install almost any substituent on the ring.
- A weak base, deliberately. Its low basicity is useful: it can be acylated and substituted without the aggressive nucleophilic behaviour of an aliphatic amine.
How Aniline is Manufactured
Aniline is made from benzene in two steps, and one route dominates global capacity completely.
- Nitration. Benzene is nitrated with mixed acid to nitrobenzene. This step is well established and run at very large scale, usually integrated with the aniline plant downstream.
- Catalytic hydrogenation. Nitrobenzene is hydrogenated over a copper, nickel or noble metal catalyst, either in the vapour phase in a fluidised bed or in the liquid phase. The nitro group is reduced to an amine. This is the dominant route and accounts for the great majority of world capacity.
- Alternative routes. Phenol can be aminated with ammonia over a catalyst, and chlorobenzene can be reacted with ammonia under pressure. Both are minor by comparison, though phenol amination persists where phenol is cheap.
- Purification. Crude aniline is purified by distillation, usually under reduced pressure to limit discolouration. Residual nitrobenzene, cyclohexylamine from over-hydrogenation, and phenol are the traces that distinguish grades.
Typical Commercial Specification
Figures below are representative of standard commercial grade. Dye-grade and low-colour material with tighter nitrobenzene and colour limits is available — send us the specification you work to and we will quote against it.
| Parameter | Typical Value |
|---|---|
| Appearance | Colourless to pale-yellow oily liquid |
| Assay (GC) | 99.9% min |
| Nitrobenzene | 10 ppm max |
| Cyclohexylamine | 50 ppm max |
| Phenol | 50 ppm max |
| Water (Karl Fischer) | 0.1% max |
| Colour (APHA) | 20 max on fresh material |
| Freezing point | −6.0 °C min |
| Distillation range | 183 – 186 °C (95% v/v) |
| Specific gravity at 20 °C | 1.021 – 1.024 |
| Iron (Fe) | 1 ppm max |
| Non-volatile residue | 0.01% max |
Physical & Chemical Properties
| Property | Value |
|---|---|
| Molecular formula | C6H5NH2 (C6H7N) |
| Molecular weight | 93.13 g/mol |
| Appearance | Colourless to pale-yellow oily liquid, darkening to brown on exposure |
| Odour | Characteristic aromatic amine, faintly fishy |
| Melting point | approx. −6 °C |
| Boiling point | approx. 184 °C at 760 mmHg |
| Vapour pressure | approx. 0.09 kPa at 25 °C |
| Relative density | approx. 1.022 g/cm³ at 20 °C |
| Flash point | approx. 70 °C (closed cup) |
| Autoignition temperature | approx. 615 °C |
| Solubility in water | Sparingly soluble — approximately 3.6 g per 100 mL at 20 °C |
| Other solvents | Miscible with ethanol, ether, benzene and most organic solvents |
| Basicity | pKa (conjugate acid) approx. 4.6 — a very weak base |
| Skin absorption | Readily absorbed through intact skin — a primary exposure route |
| Incompatibilities | Strong oxidisers, strong acids, acid chlorides, nitrous acid, copper and its alloys |
| Decomposition products | Oxides of nitrogen, carbon monoxide, carbon dioxide |
Reactivity in practice
An activated aromatic ring and a weakly basic nitrogen. Four reaction types account for almost all commercial aniline chemistry:
- Condensation with formaldehyde. Gives methylenedianiline and the polymeric methylene dianilines, which are phosgenated to MDI — the single largest outlet by a wide margin.
- Diazotisation and coupling. With nitrous acid the amine becomes a diazonium salt, which couples with phenols and naphthols into azo dyes or is displaced to install halide, cyanide, hydroxyl and other substituents.
- Acylation and alkylation. Reaction with acid chlorides, anhydrides and alkylating agents gives the substituted anilines and anilides behind pharmaceutical, agrochemical and rubber chemistry.
- Oxidative coupling and condensation. Self-condensation gives diphenylamine; condensation with ketones and other partners gives the antioxidants and antiozonants used throughout the rubber industry.
Aniline vs Diphenylamine, MDA and the Aromatic Diamines
Aromatic amines behave quite differently from aliphatic ones, and the reason is the ring. The nitrogen lone pair is delocalised into the aromatic system, which makes these compounds far weaker bases and poorer nucleophiles than their saturated counterparts — and also gives them the toxicological profile that governs how they are regulated.
| Aromatic amine | CAS | Character & principal use |
|---|---|---|
| Aniline | 62-53-3 | The parent; weak base, oily liquid — MDI, rubber chemicals, dyes, pharmaceutical intermediates |
| Diphenylamine | 122-39-4 | Secondary diaryl amine, solid — rubber and lubricant antioxidants, propellant stabiliser |
| 4,4′-Methylenedianiline (MDA) | 101-77-9 | Diamine from aniline and formaldehyde — MDI precursor, high-temperature epoxy hardener |
| m-Phenylenediamine | 108-45-2 | Aromatic diamine — azo dyes, meta-aramid fibre, epoxy hardeners, RO membranes |
Stated plainly: aniline is a weak base because its lone pair is tied into the ring, which is why it behaves nothing like cyclohexylamine despite differing by only six hydrogens. Diphenylamine, with two rings on one nitrogen, is weaker still and works as a radical scavenger rather than as a base at all. The aromatic diamines are building blocks for isocyanates and high-temperature polymers. Across the whole class, health classification rather than chemistry is usually what decides whether a given compound can be used at all in a given market.
Industries We Supply Aniline To
The same molecule leaves our warehouse for very different factories. What changes between them is not the CAS number but the grade — nitrobenzene and colour in particular — and the documentation each sector expects.
Where Aniline is Used
One application dominates global aniline consumption, with several substantial markets behind it. These are the end uses our customers buy it for, in order of volume.
In MDI and polyurethane
This single application accounts for the great majority of world aniline consumption. Aniline is condensed with formaldehyde under acid catalysis to give a mixture of methylenedianiline and higher polymeric methylene dianilines, which is then phosgenated to polymeric MDI. That isocyanate reacts with polyols to form the rigid polyurethane foam used to insulate buildings, refrigerators, cold stores and pipework. The scale of that market is what makes aniline a bulk commodity rather than a fine chemical, and it is why aniline capacity is typically built integrated with nitrobenzene upstream and MDI downstream.
In rubber chemicals
The antidegradants that keep tyres from cracking are built on aniline. Condensing aniline derivatives gives the substituted para-phenylenediamines that scavenge ozone at the rubber surface, and condensation with acetone gives the polymerised quinoline antioxidants used for heat ageing. Between them these are among the highest-volume rubber chemicals in the world, and aniline is the common ancestor.
In dyes and pigments
Aniline is where synthetic dye chemistry began and it remains central to it. The amino group strongly activates the ring, so substitution is easy; and diazotisation converts the amine into a diazonium salt that either couples directly into an azo chromophore or is displaced to install almost any other substituent. Colour on the incoming aniline is a real specification here — the material darkens on standing, and a brown feedstock will not give a reproducible shade.
In pharmaceutical and agrochemical intermediates
Substituted anilines and anilides appear throughout both industries. Aniline is the precursor to para-aminophenol, itself the precursor to one of the most widely used analgesics in the world, and to a long list of herbicide and fungicide actives built on an anilide core. These routes run at much higher purity specifications than the MDI chain, with residual nitrobenzene the critical figure.
Need Aniline for a specific grade or volume?
Tell us the grade, the nitrobenzene and colour limits you work to and the annual quantity. We will come back with a price, a lead time and a sample COA — delivered to any port worldwide.
Quality Control & Testing
Every lot is released against a batch-specific Certificate of Analysis. The methods behind the numbers are standard across the industry, and we are happy to share them or to work to your own in-house test protocol.
- Assay and impurity profile — gas chromatography quantifying nitrobenzene, cyclohexylamine, phenol and substituted aniline traces.
- Residual nitrobenzene — a dedicated sensitive determination, reported explicitly. This is the most important single figure on an aniline certificate.
- Colour — APHA / Hazen on fresh material. Aniline darkens on air and light exposure, so colour on receipt reflects transit and storage as much as manufacture.
- Freezing point — a classical and surprisingly sensitive purity check for aniline, still widely specified.
- Water content — Karl Fischer titration, which matters in phosgenation and acylation chemistry.
- Iron and residue — both relevant to colour stability and to downstream catalyst behaviour.
Common Process Problems & Likely Causes
When aniline misbehaves in a plant, the cause is usually one of a short list of things. This table is the shortcut our technical desk works through before anyone opens a complaint file.
| Symptom | Likely cause | What to check |
|---|---|---|
| Nitrobenzene detected in a downstream product | Unconverted starting material carried through from hydrogenation | Nitrobenzene figure on the batch COA; specify a tighter grade for sensitive routes |
| Material brown on arrival | Air and light exposure in transit or storage — normal for aniline | Colour versus COA, drum opacity, nitrogen blanket; assay is usually unaffected |
| Dye shade not reproducing | Colour on the incoming aniline, or substituted aniline traces | APHA on receipt, full impurity profile, retained sample comparison |
| Unexpected strong base behaviour in a reaction | Cyclohexylamine carry-over from over-hydrogenation | Cyclohexylamine figure on the COA; it behaves nothing like aniline |
| Freezing point reading low | Water or impurity carry-over | Karl Fischer result and GC profile; freezing point is a sensitive purity check here |
| Phosgenation yield below expectation | Water content, or phenol carry-over consuming reagent | Karl Fischer result and the phenol figure on the COA |
| Operator methaemoglobin finding on health surveillance | Skin absorption — the dominant exposure route for aniline | Glove selection and change frequency, splash protection, hygiene procedures |
| Corrosion on transfer fittings | Copper, brass or bronze in contact with the amine | Materials of construction — stainless steel or lined equipment |
Packaging, Storage & Shipping
- Standard packing. 200 kg net in lined steel drums, with 1000 L IBCs for larger users.
- Bulk packing. Road tankers and ISO tank containers for MDI, rubber chemical and dye producers.
- Light and air exclusion. Aniline darkens steadily on exposure to air and light. Opaque packaging and nitrogen blanketing are standard, and are the difference between a pale and a brown delivery.
- Storage. Cool, dark, well-ventilated and bunded, with containers tightly closed. Secondary containment is a sensible default given the toxicity.
- Materials of construction. Stainless steel or suitable lined vessels. Avoid copper, brass, bronze and aluminium.
- Oxygen and light exclusion. Aromatic amines darken rapidly on exposure to air and light — a surface oxidation effect rather than bulk decomposition, but one that matters where colour is specified. Nitrogen blanketing and opaque packaging are standard.
- Shelf life. Typically 12 months in unopened original packing under those conditions. Beyond that, re-test rather than assume.
- Skin contact control. Aniline is readily absorbed through intact skin, so splash containment and transfer design matter more here than for most liquids of comparable flash point. Treat a spill as a toxic exposure event, not a housekeeping one.
- Transport classification. UN 1547, Aniline, Class 6.1 toxic, Packing Group II — shipped with full dangerous-goods documentation.
Hazards & Safe Handling
Aniline is acutely toxic, readily absorbed through the skin, causes methaemoglobinaemia and carries a carcinogenicity classification. It must be handled by trained personnel under a proper risk assessment with health surveillance. The classifications below are indicative — the current SDS supplied with your consignment is the governing document.
- Skin absorption and methaemoglobin. Aniline passes readily through intact skin, and once absorbed it converts haemoglobin to methaemoglobin, which cannot carry oxygen. The clinical sign is cyanosis — a blue-grey discolouration of the lips and extremities. This is the defining hazard of the product and it is what exposure control must be designed around.
- Health surveillance. Most jurisdictions require health surveillance for workers exposed to aniline, typically including methaemoglobin monitoring. Treat this as a design requirement rather than a compliance afterthought.
- Carcinogenicity classification. Aniline carries a carcinogenicity classification in several systems. This affects labelling, exposure control and, in some jurisdictions, substitution obligations.
- PPE. Chemical-resistant gloves with a known breakthrough time for aniline, chemical goggles and face shield, and chemical-resistant clothing. Glove material selection matters more than usual here, since the hazard is absorption rather than irritation.
- Exposure control. Handle in a closed system wherever possible. Where open handling is unavoidable, local exhaust ventilation plus full splash protection, and procedures that treat any skin contact as a reportable exposure.
- Incompatibilities. Strong oxidising agents, strong acids, acid chlorides, nitrous acid and nitrites, and copper and its alloys.
- Environment. Toxic to aquatic life. Do not allow to enter drains, surface water or groundwater. Dispose through a licensed chemical waste contractor.
- First aid. Remove contaminated clothing immediately and wash the skin thoroughly with soap and water — speed matters because absorption continues while the material is in contact. Flush eyes for at least 15 minutes. Seek medical attention urgently with the SDS to hand, and tell the clinician that methaemoglobinaemia is the expected effect.
Regulatory & Compliance Notes
Aniline is one of the most heavily regulated high-volume industrial chemicals, principally because of its toxicological profile rather than its reactivity. The notes below are orientation rather than legal advice; confirm your own position with your regulatory adviser well before importing.
- Inventory status. Listed on the principal chemical inventories in the major importing regions. Ask us for the inventory confirmation relevant to your destination country.
- Import registration. Several territories require the importer to hold a registration or notification before a consignment lands. Start that process early — it is the most common cause of delay at destination.
- Hazard communication. Supplied with an SDS compliant with the format applicable to your region, and labelled in line with the GHS classification for the product.
- Carcinogenicity classification. Aniline carries a carcinogenicity classification in several regulatory systems, with consequences for labelling, workplace exposure limits, health surveillance and in some jurisdictions substitution obligations. Build this into your assessment at the design stage.
- Occupational health surveillance. Most jurisdictions require health surveillance for exposed workers, commonly including methaemoglobin monitoring. This applies downstream as well as at the point of manufacture.
- Consumer product restrictions. Aromatic amines including aniline are restricted in a range of consumer applications, particularly textiles and articles in prolonged skin contact. Where your product reaches a consumer, confirm residual aromatic amine limits at destination.
- Dangerous goods. UN 1547, Aniline, Class 6.1 toxic, Packing Group II. Declarations prepared for IMDG (sea) or IATA (air) as appropriate to the mode.
We Supply Aniline Worldwide
Chelora Chemicals is a supplier and export partner, not a single-plant trader. We ship Aniline from India to customers across Asia, Europe, the Middle East, Africa, and North and South America, handling the export documentation, dangerous-goods paperwork and freight so the material arrives ready to use.
- Incoterms. EXW, FOB, CIF, CFR and DAP quoted to suit your purchasing terms and freight arrangements.
- Ports. Regular shipments through Nhava Sheva (JNPT) and Mundra, with other Indian ports arranged where it suits the routing.
- Documentation. Commercial invoice, packing list, certificate of origin, COA, SDS and dangerous-goods declaration issued as a complete set.
- Flexible volumes. A single drum for laboratory qualification, through LCL consolidations, up to repeat full loads on a supply contract.
- Supply continuity. Because we are independent of any one producer, a plant turnaround or a shipping disruption at one source does not have to become your stock-out.
Buying Aniline from Chelora
We are an independent sourcing and supply partner. For aniline that means matching the grade to the end use — bulk technical for the isocyanate chain, tight nitrobenzene and colour for dyes and pharmaceutical intermediates — and making sure the handling infrastructure at your end matches what this product actually requires.
- Documentation on every lot. Batch-specific COA including residual nitrobenzene, current SDS and TDS.
- Samples before commitment. Trial quantities for process qualification ahead of a commercial order.
- Quantities. From a single 200 kg drum through to repeat tank loads on contract supply.
- Export experience. Class 6.1 dangerous-goods documentation, packing and labelling handled for sea and road freight.
- Technical support. Direct access to people who know the chemistry, for questions on nitrobenzene limits, colour stability or handling design.
- Related intermediates. Diphenylamine, MDA, m-phenylenediamine, cyclohexylamine, nitroanilines and the wider aromatic range.
How ordering works
- Send the enquiry. Product, grade or specification, quantity, destination port and the Incoterm you buy on. If you have a spec sheet, attach it — it saves a round trip.
- We quote. Price, lead time, packing and a sample COA, normally within one working day.
- Sample and qualify. For first orders or critical applications, we send a trial quantity so your lab can sign off before you commit.
- Confirm the order. Proforma invoice issued; payment terms agreed against the volume and the relationship.
- Production and QC. Material allocated and released against a batch-specific COA, with a pre-shipment sample where the application calls for it.
- Ship and document. Packed, labelled and loaded with the full export and dangerous-goods document set, and tracked through to arrival.
Aniline — Common Questions
The questions our technical desk is asked most often about Aniline. If yours isn't here, call or email and you will reach someone who knows the chemistry.
What is the CAS number of Aniline?
The CAS number for Aniline is 62-53-3, and its EC number is 200-539-3. It is also listed as aminobenzene, phenylamine, benzenamine and aniline oil. The molecular formula is C6H5NH2 with a molecular weight of 93.13 g/mol.
What is aniline used for?
The great majority of world production goes to methylene diphenyl diisocyanate — aniline is condensed with formaldehyde and phosgenated to give the aromatic isocyanate behind rigid polyurethane insulation foam. The remainder goes to rubber antioxidants and antiozonants, azo dyes and pigments, pharmaceutical intermediates including analgesic chemistry, agrochemical actives, rubber accelerators and a wide range of fine chemicals.
Do you supply aniline worldwide?
Yes. Chelora Chemicals supplies and exports aniline worldwide — across Asia Pacific, Europe, the Middle East, Africa and the Americas, as well as throughout India. We quote on EXW, FOB, CIF, CFR and DAP terms, ship mainly through Nhava Sheva and Mundra, and handle the commercial invoice, packing list, certificate of origin, COA, SDS and dangerous-goods declaration as a complete document set. Note that some destinations require importer registration specific to toxic substances.
What are the hazards of handling aniline?
The defining hazard is skin absorption. Aniline passes readily through intact skin, and once absorbed it converts haemoglobin to methaemoglobin, which cannot carry oxygen — the clinical sign is cyanosis, a blue-grey discolouration of the lips and extremities. It also carries a carcinogenicity classification. The modest flash point of about 70 °C misleads people into treating it as a routine liquid; it is not. Closed transfer, properly selected gloves and treating every splash as an exposure event are what matter, alongside the health surveillance most jurisdictions require.
Why is aniline a much weaker base than cyclohexylamine?
Because of the ring. In aniline the nitrogen lone pair is delocalised into the aromatic system, so it is far less available to accept a proton — the conjugate acid pKa is around 4.6. Cyclohexylamine has the same carbon skeleton saturated, so its lone pair stays on the nitrogen and the pKa is around 10.6. That is a difference of about a millionfold in basicity between two molecules that differ by six hydrogens, and it is why they are not interchangeable in any application.
Why does residual nitrobenzene matter?
Because it is unconverted starting material rather than an exotic trace, and it carries its own severe toxicity and carcinogenicity classification. It also passes through into downstream products, which is a serious problem in anything consumer-adjacent or pharmaceutical. It should be reported explicitly on the batch certificate rather than inferred from a typical specification sheet, and it is the first figure to look at.
How is aniline manufactured?
Overwhelmingly by hydrogenating nitrobenzene. Benzene is nitrated with mixed acid to nitrobenzene, which is then hydrogenated over a copper, nickel or noble metal catalyst in either the vapour or liquid phase. Minor alternative routes aminate phenol with ammonia or react chlorobenzene with ammonia under pressure. Crude aniline is purified by distillation under reduced pressure to limit discolouration.
What purity does Chelora supply, and can you meet a tighter specification?
Standard commercial grade is 99.9% minimum assay by GC, with nitrobenzene held to 10 ppm maximum, cyclohexylamine and phenol each to 50 ppm maximum, water to 0.1% maximum and colour to 20 APHA on fresh material. Dye-grade and low-colour material with tighter limits is available — send us the specification you work to.
Why has my aniline turned brown?
Air and light. Aniline oxidises on exposure to both and darkens steadily from colourless through yellow to brown. It is a surface and bulk oxidation effect rather than decomposition, and the assay is usually little affected — but in dye and pigment work the colour carries straight through and a brown feedstock will not give a reproducible shade. Opaque packaging, nitrogen blanketing and dark storage are the standard controls, and they work.
What is MDI and why does so much aniline go into it?
Methylene diphenyl diisocyanate, made by condensing aniline with formaldehyde to give methylenedianiline and its polymeric homologues, then phosgenating. The resulting isocyanate reacts with polyols to form rigid polyurethane foam, which is the dominant insulation material for buildings, refrigerators, cold stores and pipework worldwide. The scale of that market is simply enormous relative to every other aniline use, which is why aniline is a bulk commodity and why its capacity is usually built integrated with nitrobenzene upstream and MDI downstream.
Does aniline require health surveillance for workers?
In most jurisdictions, yes. Because the dominant exposure route is skin absorption and the effect is methaemoglobin formation, health surveillance commonly includes methaemoglobin monitoring for exposed workers. The carcinogenicity classification adds further obligations in several territories. Treat this as part of the plant design rather than a compliance item to be addressed afterwards.
How is aniline classified for transport?
It ships as UN 1547, Aniline, Class 6.1 toxic, Packing Group II. We supply the full dangerous-goods documentation, packing and labelling for both sea and road freight.
Why is freezing point on the specification?
Because it is a classical and surprisingly sensitive purity test for aniline, still widely used. Pure aniline freezes at about −6 °C, and even small amounts of water or impurity depress that measurably. It costs almost nothing to run and often flags a problem before the chromatography does, which is why it has stayed on aniline specifications long after being dropped from most others.
How should aniline be stored, and what is its shelf life?
Store in a cool, dark, well-ventilated and bunded area with containers tightly closed and preferably nitrogen-blanketed, in opaque packaging. Secondary containment is a sensible default given the toxicity. Use stainless steel or suitably lined equipment and avoid copper, brass and bronze. Unopened original packing typically carries a 12-month shelf life; colour will drift before anything else does.
What packing sizes and order quantities are available?
Standard packing is 200 kg net in lined steel drums, with 1000 L IBCs for larger users and road tankers or ISO tanks for MDI, rubber chemical and dye producers. Orders run from a single drum for trial work up to repeat tank loads on contract supply.
Do you provide a COA and SDS, and can I get a sample first?
Yes to both. Every consignment ships with a batch-specific Certificate of Analysis including the residual nitrobenzene figure, the current Safety Data Sheet and a Technical Data Sheet. Trial samples for process qualification are available before you place a commercial order — request one through the contact form or email source@chelorachemicals.com.
Can aniline be substituted with another amine?
In the MDI chain, no — the polymer is defined by the monomer and there is no alternative feedstock. In dye chemistry, substituted anilines and other aromatic amines give different chromophores rather than the same one made differently. In rubber chemicals the antidegradant structures are built on aniline derivatives specifically. Where a weak aromatic base is wanted rather than aniline's particular structure, there are options — but across aniline's main markets it is the molecule rather than a property that is being bought.
Ready to source Aniline?
Send us your specification, grade and annual volume. You will get a price, a realistic lead time and a sample COA from someone who understands what the material has to do in your process — delivered anywhere in the world.