5-Chloro-2-Methylaniline
5-Chloro-2-Methylaniline — widely traded under its colourant name, Fast Red KB Base — is a chlorinated ortho-toluidine built for diazotisation. As C.I. Azoic Diazo Component 32 (C.I. 37090) it is the diazo half of a long-established family of Naphthol AS pigments and azoic ("ice colour") dyes used across printing inks, textile printing and pigment manufacture, and it also serves more broadly as an aromatic amine building block for agrochemical and fine chemical synthesis.
Chelora Chemicals supplies 5-Chloro-2-Methylaniline to pigment and dye houses, agrochemical formulators and fine chemical manufacturers worldwide, in bags, drums or container quantities, with a batch COA and GHS safety data sheet on every consignment.
Product identity
- CAS Number
- 95-79-4
- IUPAC name
- 5-Chloro-2-methylaniline
- Molecular formula
- C7H8ClN
- Molecular weight
- 141.60 g/mol
- Colour Index
- C.I. 37090
- EC / EINECS
- 202-452-6
- MDL number
- MFCD00007779
- SMILES
- Cc1ccc(Cl)cc1N
- HS Code
- 2921 43*
* Confirm the exact HS heading with your customs broker — classification of halogenated toluidine derivatives varies between destination tariffs.
What 5-Chloro-2-Methylaniline is used for
5-Chloro-2-Methylaniline is an ortho-toluidine carrying a chlorine at the 5 position — a methyl group ortho to the amine and a chlorine two carbons further round the ring. In the colourant trade this exact substitution pattern has a name of its own: Fast Red KB Base, listed in the Colour Index as C.I. Azoic Diazo Component 32 (C.I. 37090). Diazotised and coupled onto a Naphthol AS coupling component, it gives the red "KB" shades used across printing inks, textile "ice colour" printing and pigment toner manufacture.
Outside colour chemistry it behaves like any other hindered, chlorinated aromatic amine: a building block for amide, urea and heterocycle formation in agrochemical and fine chemical synthesis, wherever a chloro-methyl-substituted aniline is the specified starting material.
A note on isomer confusion — please read
Chlorotoluidine nomenclature has a well-known trap, and we would rather flag it here than have it surface on a purchase order. 5-Chloro-2-methylaniline (this product, CAS 95-79-4) is a different substance from 4-Chloro-2-methylaniline — also called 4-chloro-o-toluidine or Fast Red TR Base, CAS 95-69-2 — which the International Agency for Research on Cancer classifies as a probable human carcinogen (Group 2A) and which the EU classifies as Carc. 1B. The two names differ by a single chlorine position and are genuinely mixed up in the trade. We quote and ship against the CAS number you confirm, never against a trade name alone, and we flag this distinction to every new customer on this line.
Why the substitution pattern matters more generally
- 5-Chloro-2-methylaniline (CAS 95-79-4) — this product. Chlorine meta to the methyl group; the diazo component behind Fast Red KB shades.
- 4-Chloro-2-methylaniline (CAS 95-69-2) — the carcinogen-classified isomer described above; a different regulatory category entirely.
- Other chloro-toluidine isomers exist for other Colour Index diazo components and other end uses; always confirm the CAS number before ordering.
If your purchase order or formulation sheet simply says "chlorotoluidine" or "KB base", quote us the CAS number and we will confirm the correct material before the order is placed. Browse the full aniline and aromatic amine range or send us the specific CAS number you need.
Appearance and handling character
5-Chloro-2-Methylaniline has a melting point right around ordinary ambient temperature (roughly 22–24 °C), so commercial material is reported as white to yellow or orange, ranging from a powder or lump through to a clear liquid depending on storage temperature — it may arrive solid, fully melted, or as a solidified or supercooled melt, and that is normal rather than a sign of an off-spec batch. It is only sparingly soluble in water (under 1 g/L) but dissolves readily in alcohols and most organic solvents. Like other primary aromatic amines it darkens slowly on exposure to air and light, and it is light- and air-sensitive enough that suppliers recommend storage in a cool, dark place.
| Parameter | Typical value |
|---|---|
| Appearance | White to yellow / orange powder, lump or clear liquid |
| Assay (GC) | 98.0% min |
| Melting range | 22 – 28 °C |
| Moisture (KF) | 0.3% max |
| Total isomeric impurities | 1.0% max (including CAS 95-69-2) |
| Non-volatile residue | Reported per batch |
Important: the figures above are indicative of commercial grade material and are offered for planning only. The batch certificate of analysis is the governing document. If your process demands a tighter assay, a specific isomer limit, a colour ceiling or a controlled moisture figure, send us the specification and we will quote against it rather than against a generic grade.
| Property | Value |
|---|---|
| Physical state | Solid, liquid or melt at ambient (mp near 20–25 °C) |
| Melting point | ≈ 22 – 24 °C |
| Boiling point | ≈ 237 – 241 °C @ 760 mmHg |
| Flash point | ≈ 160 °C (closed cup) |
| Autoignition temperature | > 540 °C |
| Relative density | ≈ 1.17 g/cm³ @ 20 °C |
| Refractive index | ≈ 1.58 |
| Vapour pressure | ≈ 0.45 hPa @ 50 °C |
| Water solubility | < 1 g/L @ 22 °C |
| Organic solubility | Soluble in alcohols and most common organic solvents |
| Oral LD50 (rat) | ≈ 464 mg/kg |
| Odour | Faint, amine-like |
Physical constants compiled from public reference data for CAS 95-79-4 and rounded for readability; values vary slightly between reagent suppliers and purity grades. Treat them as orientation, not as a specification.
Where our customers put this molecule to work
5-Chloro-2-Methylaniline earns most of its volume as a named Colour Index diazo component, with a secondary life as a general chlorinated aromatic amine intermediate.
Naphthol AS pigments & azoic dyes
The signature outlet. As Fast Red KB Base / C.I. Azoic Diazo Component 32, the amine is diazotised and coupled onto Naphthol AS derivatives to give the Fast Red KB family of shades used in pigment toners, printing inks and "ice colour" textile printing.
- C.I. Azoic Diazo Component 32 · C.I. 37090
- Isomer purity shows up directly as off-shade
- Coupled onto Naphthol AS components
Printing inks & textile printing
Ink and textile printers who work with ice colours or pigment-based red shades specify this grade by its Colour Index number as much as by chemical name — we quote and document against both so your incoming-goods checks match your formulation records.
- Rapidogen / ice colour dyeing routes
- Pigment toner manufacture
- Batch colour reported on every COA
Agrochemical intermediates
The chlorinated, methyl-substituted aniline nitrogen also serves general agrochemical synthesis routes that specify a hindered aromatic amine building block, in amide, urea and related condensation chemistry.
- Amide and urea formation
- See our agrochemical intermediate range
- Confirm CAS number before quoting a route
Fine & specialty synthesis
A well-characterised, hindered aryl amine building block for custom amides, ureas and Schiff bases where the 5-chloro-2-methylphenyl fragment is required and the chlorine may itself be a handle for later chemistry.
- Custom amide and urea formation
- Chlorine retained for later coupling
- Available in trial and laboratory quantities
Research & building-block supply
Widely held as a reagent-grade building block by fine chemical suppliers for R&D scale-up. We bridge the gap between a small reagent pack and a commercial campaign quantity, at consistent quality throughout.
- Gram-to-kilo scale-up support
- Same specification from lab lot to plant lot
- Full analytical pack on request
Contract & scheduled supply
Pigment and dye plants run to production campaign, not to a calendar month. Most buyers on this line want tonnage released against a production plan rather than in one shipment. We hold inventory and release it to your schedule.
- Annual contracts with scheduled call-off
- Price held across the contract period
- Second source held in reserve
How we supply 5-Chloro-2-Methylaniline
Chelora Chemicals is a supplier and sourcing partner, not a manufacturer. We own no chlorotoluidine plant — and for a name-sensitive intermediate like this one, where a single-digit CAS difference separates it from a carcinogen-classified isomer, that independence and diligence work in your favour.
Instead we place your order with whichever qualified producer best matches your assay, your isomer tolerance, your price point and your delivery window.
We keep a second qualified source on this line. When a plant goes down for maintenance or a logistics disruption hits a route, your campaign switches source rather than stalling.
- CAS number confirmed before we quote. We verify you need 95-79-4 — Fast Red KB Base — and not CAS 95-69-2, before a price ever goes out.
- Batch COA shared before dispatch. You approve the assay, isomer profile, moisture and colour reading against your own spec while the material is still in our warehouse.
- Hazard status stated up front. This material is an acutely toxic, organ-damage-classified aromatic amine, and we say so at enquiry stage — not in the small print of a document pack that arrives with the goods.
- Pre-shipment samples for qualification. New account or new source, your R&D or colour laboratory runs a lab batch and a shade trial before the full quantity ever moves.
- Packing chosen for your climate. With a melting point sitting right at ambient temperature, pack format and stowage matter on any long or tropical routing. We plan both with you.
- Export machinery handled in-house. Hazard classification, UN-approved packing, labelling, freight booking and customs paperwork are ours to manage.
- Consolidation onto one bill of lading. Ship this grade alongside other intermediates from our range — one invoice, one shipment, one counterparty.
Packed the way your plant receives it
Because this grade sits right at its melting point at ordinary room temperature, pack format and stowage matter more than for a conventional solid. Tell us how it will be charged at your end and we will quote the format that suits your operation.
Multi-wall paper & PE bags
Laminated multi-wall bags with an inner liner, palletised and shrink-wrapped, for material solidified into flake or lump. The default for LCL movements to plants charging batch-wise by hand.
Fibre & HDPE drums
UN-approved drums with liner for longer sea transits and humid or hot destinations — better protection against melting, moisture pick-up and colour drift than bagged material.
Jumbo / FIBC bags
Bulk bags with liner for high-volume users with mechanical charging, provided the routing stays cool enough to keep the material in solid form. Fewer handling movements and lower packing cost per kilo.
Samples & trial packs
Laboratory samples and pilot quantities dispatched by courier so your R&D or colour laboratory can qualify the grade and run a shade trial before committing to campaign volume.
Incoterms to suit you
Quoted on the Incoterm your purchasing team works to. Ocean, air and road freight arranged end-to-end with documentation filed before booking.
Campaign despatch
Pigment and dye production runs to campaign. We hold contracted tonnage and release it against your production calendar instead of landing it all at once.
Handle this as a toxic, organ-hazard aromatic amine
This is the point on the page that matters most. 5-Chloro-2-Methylaniline is harmful if swallowed, an eye and skin irritant, and — under the classification published by several suppliers — carries a single- and repeated-exposure organ damage entry (H370/H372). Based on the data we have found, it is not classified as a carcinogen — but see the isomer note above, and treat that distinction as part of your own risk assessment rather than taking it on trust from any one document. The summary below is orientation only — the safety data sheet supplied with your consignment is the authoritative document and should govern your risk assessment, PPE selection, exposure monitoring and emergency planning.
Classified hazards
H302Harmful if swallowed.H315Causes skin irritation.H319Causes serious eye irritation.H370Causes damage to organs.H372Causes damage to organs through prolonged or repeated exposure.
Hazard statements reflect the harmonised GHS classification commonly published for CAS 95-79-4 (a related listing shows Acute Tox. 4 oral, Eye Irrit. 2, Skin Irrit. 2 and STOT SE 3). Supplier classifications vary in detail; always read the SDS issued with your specific batch, and do not substitute hazard data for CAS 95-69-2 — the carcinogen-classified isomer described above.
Spill & emergency orientation
Plan your response before the pallet arrives, not after a bag splits or a drum warms past its melting point. The points below are orientation for your emergency planners — sections 4, 5 and 6 of the SDS are the authoritative instructions and should be posted at the point of use.
- Contain, do not hose to drain. Collect spilled solid or liquid mechanically into a labelled container; never wash it to a drain or watercourse — the material is rated as a severe water hazard (WGK 3 in the German scheme).
- Suppress dust when handling the solid. Dry sweeping of a fine solid generates an inhalable aerosol — use vacuum collection or dampen carefully in line with the SDS.
- Assume skin absorption. Contaminated clothing is a continuing exposure route — remove it immediately and wash the skin thoroughly.
- Have the SDS with the casualty. Chlorotoluidines are systemically toxic on ingestion or significant exposure, and the treating clinician needs the exact product identity and CAS number in hand.
- Record the exposure. For a material with an organ-damage classification, most occupational regimes expect an exposure record to be created and retained — a decision for your EHS function, easier made before an incident than after one.
Storage
- Cool, dark, well-ventilated store, ideally below 15 °C. The melting point sits right at ordinary room temperature, so a warm store will let the material melt, migrate and re-solidify unevenly inside its packaging.
- Keep containers tightly closed and under inert gas where specified. The product is both light- and air-sensitive, and open containers accelerate the buff-to-brown colour drift typical of anilines.
- Segregate from oxidising agents, strong acids and acid chlorides. As a primary aromatic amine it reacts exothermically with acylating and oxidising reagents.
- Access-controlled, bunded storage. For a material with an organ-damage classification, restricting who can reach the store is part of the control, not an administrative nicety.
- Shelf life is typically 12–24 months in sealed original packing under these conditions. Re-assay before use after long storage, and re-check colour if your application is shade-critical.
Handling & PPE
- Design exposure out, do not manage it down. Closed transfer and mechanical charging first, ventilation second, PPE last — the standard hierarchy of control for a toxic aromatic amine.
- Skin protection is the priority. Chlorotoluidines are absorbed through intact skin — chemical-resistant gloves and coveralls, not just splash protection. H315 also applies, so irritation is a real risk for repeat handlers.
- Respiratory protection where dust may be generated — particularly when breaking a solidified cake or emptying a bulk bag — per your own exposure assessment.
- Health surveillance and exposure records. Where an organ-damage classification triggers obligations at your site, your occupational health provider and EHS function own the detail. We flag the classification; the programme is yours to run.
- Never discharge to drain or watercourse. Collect spills as solid or liquid waste and dispose of them as regulated chemical waste given the substance's aquatic hazard rating.
Transport
5-Chloro-2-Methylaniline moves as regulated cargo, classified for its acute toxicity and organ-damage entries. We classify each consignment, apply UN-approved packaging and labelling, and file the dangerous-goods declaration before the booking is made. The applicable UN number, class and packing group are stated on your shipping documents and SDS — ask us for the current DG paperwork when you plan the shipment.
What travels with every consignment
A chemical shipment is only as good as the file that travels with it. Verifying what the source plant sends is precisely the work you are buying from a supplier — and on this product, that includes confirming the isomer as well as the assay.
Certificate of Analysis
Batch-specific assay by GC, moisture by Karl Fischer, appearance, melting range, colour and impurity profile — including a check against the CAS 95-69-2 isomer — checked against your purchase specification before we release the goods.
GHS Safety Data Sheet
Full 16-section SDS in GHS format covering hazards, exposure controls, handling, storage, spill response, toxicology and disposal — issued in the language your destination requires.
Dangerous Goods Declaration
UN number, hazard class, packing group and IMDG or IATA declaration prepared and filed before the container is booked, with correctly marked and labelled packaging.
Certificate of Origin
Chamber-attested where required, plus preferential-origin forms where a trade agreement gives your import duty relief at the destination.
Third-party inspection
SGS, Intertek or Bureau Veritas sampling and inspection arranged on request before loading, giving you independent verification of what actually ships.
Retained & pre-shipment samples
Pre-shipment samples carry the same COA as the commercial lot, so what your laboratory qualifies — and what your colour trial approves — is exactly what arrives. Retention samples held against the batch.
From aniline to Fast Red KB shade
Almost everything made from this amine leaves through one door: the diazonium salt. Understanding that route explains why the specification — and the isomer identity — matters so much for a Colour Index diazo component. The pattern below is the general industrial pattern, not a process disclosure.
Start with the toluidine
5-Chloro-2-methylaniline provides a primary aromatic amine with a fixed methyl and chlorine substitution pattern, giving a well-defined electronic profile for the diazotisation step.
Diazotise
Sodium nitrite in acid at low temperature converts the amine to the diazonium salt — the reactive intermediate that carries the colour chemistry forward.
Couple onto Naphthol AS
The diazonium salt is coupled onto a Naphthol AS derivative to build the insoluble azo chromophore that gives Fast Red KB its characteristic shade, fastness and solvent resistance.
Finish to grade
The crude pigment or dye is filtered, washed and finished to whatever the end market demands — a printing-ink toner, a textile ice colour, or a pigment intended for paints and coatings.
Why aniline identity carries through the whole route
The diazotisation step acts on the exact substitution pattern of the amine. Anything that differs from the specified isomer follows the material all the way to the finished shade:
- Isomeric chlorotoluidines diazotise and couple in parallel, giving structurally similar chromophores that read as off-shade or dulled colour in a finished pigment or dye.
- The CAS 95-69-2 isomer specifically is not just an off-shade risk but a regulatory one — its presence above trace level can move a batch into a different hazard classification entirely.
- Residual water or oxidation products can interfere with clean diazotisation and show through as colour or texture defects in the finished pigment.
- Heavy residues concentrate in the mother liquor and reduce yield and filterability on the coupling step.
That chain of consequences is the reason we quote against your written specification rather than a generic "technical grade," and the reason the batch COA — including an isomer check — is shared for approval before dispatch rather than sent with the invoice.
| CAS & name | Trade name / status |
|---|---|
| 95-79-4 5-Chloro-2-methylaniline — this product | Fast Red KB Base C.I. Azoic Diazo Component 32 Not carcinogen-classified per available data |
| 95-69-2 4-Chloro-2-methylaniline | Fast Red TR Base C.I. Azoic Diazo Component 11 IARC 2A / EU Carc. 1B |
We do not supply CAS 95-69-2. If your formulation genuinely calls for it, that is a separate regulatory conversation your EHS and procurement teams should have with full information in hand — always confirm the CAS number and Colour Index reference against your own formulation records before you place an order for either material.
What actually moves the price of this intermediate
5-Chloro-2-Methylaniline is not a commodity with a screen price. Knowing what drives the quote helps you time a purchase and read whether an offer is realistic.
Pigment & textile-print seasonality
Ink and textile-print demand for KB shades moves with production seasons in those industries, so quotes and lead times can shift with the finishing-industry calendar rather than a general chemicals cycle.
- Quote early for campaign tonnage
- Spot buying at peak costs materially more
- Contracted call-off smooths the exposure
Upstream feedstock
The route back to this amine runs through the chlorination and reduction chain that starts from toluidine or its precursors. Movements in chlorine, toluene and hydrogen feed through within a quarter or so.
- Chlorine and toluene set the floor
- Energy cost weighs on purification
- We flag feedstock-driven moves in the quote
Regulatory attention on the class
Chlorotoluidines as a family attract regulatory scrutiny because of the carcinogen classification on a sister isomer. That scrutiny raises testing, documentation and compliance cost across the whole family, and this product is not exempt from that overhead even though it is not itself carcinogen-classified.
- Handling obligations vary by jurisdiction
- Isomer testing adds to the COA cost
- We check destination rules before quoting
Pack format
Cost per kilo falls from 25 kg bags to drums to jumbo bags — but with a melting point at ambient temperature, the cooler, better-sealed pack formats also protect against melting, caking and colour drift in transit.
- Small bags carry the highest packing cost
- Drums protect best against heat and moisture
- We advise on format against your routing
Freight & DG surcharges
This is regulated cargo, so ocean freight carries a hazardous surcharge and space is tighter than for general cargo. Destination and Incoterm move landed cost as much as the ex-works price does.
- Compare on landed cost, not ex-works
- DG space books out ahead of peak season
- We quote FOB, CIF, CFR or DDP as you prefer
Source availability
A plant turnaround, an environmental inspection or a shipping disruption can take capacity offline at short notice. Single-sourced buyers feel this hardest.
- We hold a second qualified source on this line
- Qualify the alternate before you need it
- Ask us about dual-source contracts
| If your end use is… | Specify |
|---|---|
| Naphthol AS pigments / KB shades | Colour ceiling, tight isomer limit vs. CAS 95-69-2 |
| Textile ice-colour printing | High assay with controlled moisture and colour |
| Agrochemical intermediate route | High assay; residue and metals reported |
| Fine chemical / custom synthesis | Tight isomer limit; full analytical pack |
| Laboratory / R&D | Small pack, high purity, full analytical pack |
Not sure which column you are in? Describe the reaction or shade you are targeting and our technical desk will recommend the grade — including telling you when a cheaper specification would do the job just as well.
Support that goes beyond shipping the bag
What our technical desk will do
- Confirm the CAS number against the isomer risk. Every enquiry on this line gets an explicit check against CAS 95-69-2 before we quote, whatever name or trade term the purchase order uses.
- Match a grade to your reaction or shade. Tell us the step or shade you are targeting and we will recommend the specification — and say so plainly when a tighter, costlier grade would add nothing.
- Be straight about the hazard profile. We state the acute toxicity and organ-damage classification at enquiry stage so your EHS team can price the controls into the decision, rather than meeting it for the first time on the label.
- Advise on handling and storage for your site conditions — a store that lets the drum sit above 25 °C is a different problem for this grade than for a conventional high-melting solid.
- Review your specification before it goes into a contract, so you are not locked into a limit that no plant can consistently hit.
Regulatory & compliance notes
- Toxic-substance obligations are jurisdiction-specific. Several regimes impose exposure monitoring, health surveillance and record retention around organ-damage-classified aromatic amines. Confirm what applies at your site before the first delivery.
- Import controls vary by destination, and some jurisdictions scrutinise chlorotoluidines as a class given the carcinogen classification on a sister isomer. We check the destination rules before quoting, not after you have raised the PO.
- Chemical inventory listings differ between regions. Confirm your obligations under the applicable inventory regime for your import volume — we will supply the identity data you need for that filing.
- Colourant and finished-article restrictions can apply to certain textile, ink and consumer-product end uses. Your regulatory team should confirm the finished-article position for the end use you have in mind.
None of the above is legal advice — your own regulatory affairs team owns the final compliance position for your import and your workplace. What we commit to is giving you accurate product identity data, an honest statement of the hazard classification and complete documentation to work from.
From enquiry to delivered pallet
Send the specification
Product name or CAS 95-79-4, the assay and impurity limits you work to, quantity, pack preference and destination port.
Receive a firm quote
Pricing, lead time, packing and Incoterm confirmed in writing within 24 hours — our sourcing desk is staffed around the clock.
Qualify and approve
Sample dispatched if you are qualifying a new source. Batch COA — including the isomer check — shared for your approval before the material is released.
Ship and track
DG classification filed, freight booked, export documents issued, and the consignment tracked through transit and clearance to your plant.
Often bought alongside this grade
Consolidate several intermediates onto one shipment and one invoice. These are the chlorotoluidines, chloroanilines and Colour Index diazo components our pigment, dye and fine chemical customers most often order in the same programme. Not every name below has its own page yet, so each one routes to our full product catalogue where our sourcing desk can confirm availability against the exact CAS number.
What buyers ask us about 5-Chloro-2-Methylaniline
Is this the same substance as the carcinogen-classified chlorotoluidine?
What is Fast Red KB Base, and is that the same product?
Why is the material sometimes a solid and sometimes a liquid?
What purity do you normally supply?
What is the minimum order quantity?
How long does delivery take?
Why does the solid darken in storage?
How should we store it, and what is the shelf life?
Is this a dangerous good? What paperwork comes with it?
- Batch certificate of analysis, including an isomer check
- GHS-format safety data sheet
- Dangerous-goods declaration with UN number, class and packing group
- Commercial invoice, packing list and bill of lading or airway bill
- Certificate of origin and any destination-specific forms
Do you supply to my country?
Do you manufacture this yourself?
Can you hold stock against a production plan?
Request pricing on 5-Chloro-2-Methylaniline
Send your required assay, quantity, pack format and destination port. Our sourcing desk is available 24 hours a day, 7 days a week, and comes back with pricing, lead time and packing options — whether that is a single trial bag or a contracted container programme for the year.