2,4-Toluenediamine
The key precursor to toluene diisocyanate (TDI) — the diisocyanate behind most of the world's flexible polyurethane foam, from furniture cushioning to automotive seating.
Chelora Chemicals supplies 2,4-toluenediamine to polyurethane and specialty-chemical manufacturers worldwide, with full documentation and regulatory support on every consignment.
Product identity
- CAS Number
- 95-80-7
- IUPAC name
- 4-Methylbenzene-1,3-diamine
- Molecular formula
- C₇H₁₀N₂
- Molecular weight
- 122.17 g/mol
- Melting point
- 97-99 °C
- Boiling point
- 283-285 °C
- UN Number
- UN 1709 / UN 3814
- HS Code
- 2921 51*
* Confirm the current HS classification and import regulatory status for your destination with your own regulatory affairs team.
What 2,4-Toluenediamine is used for
2,4-Toluenediamine (2,4-TDA) is a tan to light-brown crystalline solid at room temperature, handled as flake or in solution for industrial use. Structurally it is a toluene ring carrying two amine groups in the 2- and 4-positions, placing it among the aromatic diamines that feed the polyurethane industry.
2,4-TDA's defining use is as the key precursor to toluene diisocyanate (TDI): it is reacted, typically with phosgene, to form 2,4-TDI, which is blended with its 2,6-isomer to make commercial TDI — the diisocyanate behind most flexible polyurethane foam used in furniture cushioning, mattresses, automotive seating and carpet underlay. 2,4-TDA is also used as an intermediate in dye chemistry and, under tightly regulated conditions, in certain hair-dye formulations, and serves as a research feedstock in polymer chemistry.
Where it sits in the aromatic amine family
- Aniline the simplest aromatic amine, feedstock for several related aromatic diamines. See that page.
- 2,4-Toluenediamine (this product) the dominant precursor to commercial TDI.
- m-Phenylenediamine a related aromatic diamine used in aramid fibre and epoxy chemistry. See that page.
Appearance and handling character
2,4-TDA is harmful if swallowed, may cause an allergic skin reaction, is suspected of causing genetic defects, may cause cancer, is suspected of damaging fertility, causes damage to organs through repeated exposure, and is toxic to aquatic life with long-lasting effects. Full hazard detail is in the Safety section below.
| Parameter | Typical value |
|---|---|
| Appearance | Tan to light-brown flake / crystalline solid |
| Assay | 98.0% min |
| Melting point range | 96-99 °C |
| Isomer ratio | Per producer specification |
Important: the figures above are indicative of commercial material and are offered for planning only. The batch certificate of analysis is the governing document.
| Property | Value |
|---|---|
| Physical state | Tan to light-brown crystalline solid |
| Boiling point | 283-285 °C |
| Melting point | 97-99 °C |
| Density | 1.26 g/cm³ |
| Water solubility | Soluble |
| Amine class | Bis-primary aromatic amine |
Physical constants compiled from public reference data for CAS 95-80-7 and rounded for readability. Treat them as orientation, not as a specification.
Where our customers put this diamine to work
The amine building block behind most of the world's flexible polyurethane foam.
TDI precursor
Reacted to form toluene diisocyanate (TDI), the diisocyanate behind most flexible polyurethane foam production.
- Technical-grade specification
- Bulk & drum supply
- Technical desk review on request
Flexible foam chemistry
Underpins TDI-based flexible foam used in furniture cushioning, mattresses and automotive seating.
- Documented batch traceability
- Contract & spot supply
- Handling guidance included
Dye intermediate
Used as a synthesis intermediate in dye and colourant chemistry.
- Packs sized to customer volumes
- Full analytical documentation available
- Retained sample held against the lot
Regulated hair-dye chemistry
Used, under tightly regulated conditions, as an intermediate in certain hair-dye formulations.
- Regulatory-compliant supply
- Documented batch traceability
- Technical desk review on request
Polymer research feedstock
Supplied in research and process-scale quantities for polymer-chemistry development work.
- Research & process-scale quantities
- Full documentation supplied
- Technical desk review on request
Contract & scheduled supply
Polyurethane plants running continuous consumption are supported with scheduled bulk delivery.
- Annual contracts with scheduled call-off
- Price held across the contract period
- Second source held in reserve
How we supply 2,4-Toluenediamine
Chelora Chemicals is a supplier and sourcing partner, not a manufacturer. 2,4-TDA's recognised hazard profile means regulatory documentation and controlled handling are central to every order — that shapes how we manage this line.
We place your order with whichever qualified producer best matches your required grade, your price point and your delivery window, and confirm your jurisdiction's import and occupational-exposure requirements before booking.
We keep a second qualified source on this line, so a single-plant disruption never becomes your production problem.
- Assay and melting range confirmed before we quote. Consistency matters to downstream TDI feedstock quality.
- UN 1709/3814 documentation managed end to end. Classification, labelling and carrier compliance confirmed before booking.
- Hazard declarations filed correctly. Every shipment carries the correct hazard and regulatory declarations.
- Scheduled call-off scheduling. We hold contracted tonnage and release it against your consumption calendar.
- Batch traceability to the producing plant. Full chain of custody documentation on request.
- Export machinery handled in-house. Classification, approved packing, labelling, freight booking and customs paperwork are ours to manage.
Packed the way your plant receives it
Drum, bulk bag or ISO tank — tell us your preferred format and we will quote and classify to it.
Fibre or steel drums
For flake material, rated for UN 1709/3814-classified handling and transport.
Polyurethane-plant bulk volumes
Sized to continuous TDI-feedstock plant consumption.
Minimised-exposure handling
Transfer arrangements discussed with your EHS team to minimise operator exposure consistent with this product's hazard profile.
Incoterms to suit you
Quoted on the Incoterm your purchasing team works to, with documentation filed before booking.
Trial / sample quantities
Small packs dispatched for process trials before a commercial order is placed, with handling guidance attached.
Contracted call-off supply
We hold contracted tonnage and release it against your consumption calendar.
Toxic & suspected carcinogen — handle accordingly
2,4-TDA's recognised hazard concern makes engineering controls, PPE and exposure monitoring the central handling priorities. The summary below is orientation only — the safety data sheet supplied with your specific batch, and your jurisdiction's occupational exposure limits, are the authoritative documents.
Classified hazards
H301Toxic if swallowed.H311Toxic in contact with skin.H317May cause an allergic skin reaction.H341Suspected of causing genetic defects.H350May cause cancer.H361fdSuspected of damaging fertility or the unborn child.H373May cause damage to organs through prolonged or repeated exposure.H410Very toxic to aquatic life with long-lasting effects.
Occupational exposure limits apply. Always read the SDS issued with your specific batch and follow your site's engineering controls and medical-surveillance requirements for this material.
Storage
Store in tightly closed containers in a cool, dry, well-ventilated and access-controlled area, away from strong oxidisers and acids.
Handling
Use with engineered local exhaust ventilation and closed-transfer systems wherever possible. Skin and respiratory exposure must be controlled to the applicable occupational exposure limit, with appropriate PPE, medical surveillance and training for personnel.
Transport
Shipped as UN 1709 or UN 3814 depending on form and concentration. We confirm and document packing group and exact classification for your specific shipment and destination.
Every batch, documented
We verify documentation before dispatch so there are no surprises at your incoming-goods bench.
Specification agreed
Assay, melting range and regulatory documentation confirmed against your process requirement before order placement.
Producer batch testing
The producing plant tests each batch against the agreed specification before release.
Documentation review
COA, SDS and transport paperwork checked by our desk before the shipment is booked.
Traceable dispatch
Each shipment is traceable to its producing batch, with full chain-of-custody records on request.
How 2,4-TDA is made
2,4-Toluenediamine is produced industrially by the catalytic reduction of dinitrotoluene (DNT), a long-established route in aromatic-amine chemistry, followed by isomer separation and purification to the required assay.
We do not publish operating process parameters here; this is background only. Full technical, safety and regulatory documentation accompanies every shipment, and any process-specific detail you need is best confirmed directly with our technical desk.
| Chemical family | Bis-primary aromatic amine |
|---|---|
| Nitrogen sites | Two primary aromatic amine groups |
| Reactivity | Converts to TDI via phosgenation; reacts with epoxides and carbonyls |
| Related compounds | Dinitrotoluene (precursor), TDI (downstream), 2,6-toluenediamine (co-isomer) |
Explore the wider amine range
2,4-Toluenediamine, answered
What is 2,4-toluenediamine used for?
How does 2,4-TDA relate to TDI?
Is 2,4-toluenediamine hazardous?
What grade do you supply?
What packing do you offer?
Do you manufacture this yourself?
- Need a related amine? See our Aniline and m-Phenylenediamine pages.
Get a quote on 2,4-Toluenediamine today
Send us your required grade, pack size and delivery window. We will come back with a firm quote, lead time and full documentation.