m-Phenylenediamine
An aromatic diamine building block behind high-strength aramid fibres, epoxy curing systems and polyurea coatings — valued wherever thermal stability and chemical resistance matter.
Chelora Chemicals supplies m-phenylenediamine to fibre, resin and coatings manufacturers worldwide, with full documentation and regulatory support on every consignment.
Product identity
- CAS Number
- 108-45-2
- IUPAC name
- Benzene-1,3-diamine
- Molecular formula
- C₆H₈N₂
- Molecular weight
- 108.14 g/mol
- Melting point
- 64-66 °C
- Boiling point
- 282-284 °C
- UN Number
- UN 1673
- HS Code
- 2921 51*
* Confirm the current HS classification and import regulatory status for your destination with your own regulatory affairs team.
What m-Phenylenediamine is used for
m-Phenylenediamine (MPDA) is a colourless to light-tan crystalline solid that darkens on exposure to air and light, typically handled under inert or light-protected conditions. Structurally it is the simplest of the aromatic diamines treated on this site — a single benzene ring carrying two amine groups in the 1,3- (meta) positions, with no bridging methylene or methyl group.
That simple, symmetric structure makes MPDA valuable in applications demanding thermal stability and chemical resistance: it is a key monomer in the synthesis of aramid fibres (high-strength, heat-resistant fibres used in protective and reinforcement applications), a curing agent for epoxy resins where elevated heat-distortion performance is required, a component in polyurea coating systems, and an intermediate in dye, fungicide and corrosion-inhibitor synthesis.
Where it sits in the aromatic amine family
- Aniline the simplest mono-amine aromatic, feedstock for several related diamines. See that page.
- 2,4-Toluenediamine a methyl-substituted aromatic diamine used for TDI. See that page.
- m-Phenylenediamine (this product) the unsubstituted meta-diamine, suited to aramid-fibre and epoxy-curative chemistry.
Appearance and handling character
MPDA is toxic if swallowed, toxic in contact with skin, may cause an allergic skin reaction, causes serious eye irritation, toxic if inhaled, is suspected of causing genetic defects, and is very toxic to aquatic life with long-lasting effects. Full hazard detail is in the Safety section below.
| Parameter | Typical value |
|---|---|
| Appearance | Colourless to light-tan flake / crystalline solid |
| Assay | 99.0% min |
| Melting point range | 63-66 °C |
| Colour stability | Darkens on air/light exposure — packed accordingly |
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 | Colourless to light-tan crystalline solid |
| Boiling point | 282-284 °C |
| Melting point | 64-66 °C |
| Water solubility | Soluble |
| Amine class | Bis-primary aromatic amine (meta-substituted) |
Physical constants compiled from public reference data for CAS 108-45-2 and rounded for readability. Treat them as orientation, not as a specification.
Where our customers put this diamine to work
A thermally stable aromatic diamine spanning high-performance fibre, resin and coatings chemistry.
Aramid-fibre monomer
A key monomer in the synthesis of high-strength, heat-resistant aramid fibres.
- Technical-grade specification
- Light-protected packaging
- Technical desk review on request
Epoxy-resin curative
Used as a curing agent in epoxy formulations where elevated heat-distortion performance is required.
- Documented batch traceability
- Contract & spot supply
- Handling guidance included
Polyurea coating systems
Used as a component in fast-reacting polyurea coating and lining formulations.
- Packs sized to customer volumes
- Full analytical documentation available
- Retained sample held against the lot
Dye & colourant intermediate
Used as a synthesis intermediate in dye and colourant chemistry.
- Technical-grade specification
- Documented batch traceability
- Technical desk review on request
Fungicide & corrosion-inhibitor intermediate
Used in the synthesis of select fungicide and corrosion-inhibitor compounds.
- Research & process-scale quantities
- Full documentation supplied
- Technical desk review on request
Contract & scheduled supply
Fibre, resin and coatings processors running continuous consumption are supported with scheduled delivery.
- Annual contracts with scheduled call-off
- Price held across the contract period
- Second source held in reserve
How we supply m-Phenylenediamine
Chelora Chemicals is a supplier and sourcing partner, not a manufacturer. MPDA's sensitivity to air and light, combined with its recognised hazard profile, means careful packaging and documentation are central to 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 colour confirmed before we quote. Consistency matters to downstream fibre and resin quality.
- UN 1673 documentation managed end to end. Classification, labelling and carrier compliance confirmed before booking.
- Light- and air-protected packaging. Specified to preserve colour and purity in transit and storage.
- 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 or carton, light-protected where needed — tell us your preferred format and we will quote and classify to it.
Fibre or steel drums
For flake material, rated for UN 1673-classified handling and transport.
Colour-preserving packaging
Sealed, light-protected packaging specified to preserve colour and purity in storage and transit.
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 — handle accordingly
MPDA's recognised toxicity 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.H319Causes serious eye irritation.H331Toxic if inhaled.H341Suspected of causing genetic defects.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, light-protected 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, eye 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 1673. 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, colour 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 MPDA is made
m-Phenylenediamine is produced industrially by the catalytic reduction of m-dinitrobenzene, a long-established route in aromatic-amine chemistry, followed by 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 (meta-substituted) |
|---|---|
| Nitrogen sites | Two primary aromatic amine groups |
| Reactivity | Condenses with aromatic diacid chlorides (aramid synthesis); reacts with epoxides and isocyanates |
| Related compounds | m-Dinitrobenzene (precursor), 2,4-toluenediamine, aramid polymer (downstream) |
Explore the wider amine range
m-Phenylenediamine, answered
What is m-phenylenediamine used for?
How does m-phenylenediamine differ from the other toluenediamines and MDA?
Is m-phenylenediamine hazardous?
What grade do you supply?
What packing do you offer?
Do you manufacture this yourself?
- Need a related amine? See our Aniline and 2,4-Toluenediamine pages.
Get a quote on m-Phenylenediamine today
Send us your required grade, pack size and delivery window. We will come back with a firm quote, lead time and full documentation.