- ▸ Aliphatic diamine curing agent for epoxy resins, giving a flexible, impact-resistant cured film
- ▸ Diamine chain extender/monomer for polyamide and polyurethane systems
- ▸ Used in industrial coatings and adhesives requiring a primary-amine cure
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
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Hexamethylenediamine (HMDA) is a linear aliphatic diamine used as an epoxy hardener and, in large volume, as the monomer for nylon-6,6. Identity: CAS 124-09-4.
What it is
Hexamethylenediamine (CAS 124-09-4) is a diamine with a six-carbon chain. It is best known as a nylon-6,6 monomer (with adipic acid) and is also used as an epoxy hardener and a building block (e.g. for HDI).
How it cures
As an epoxy hardener its primary amines ring-open epoxide groups; the longer chain gives a somewhat more flexible network than short amines. Its dominant use, however, is as a polyamide monomer.
Applications
HMDA is used as a nylon-6,6 monomer, an epoxy hardener, and a building block for diisocyanates and polyamides. Related building blocks: MPMD.
Forms, grades and handling
HMDA is supplied as a solid/molten or aqueous-solution grade in drums and bulk. Properties are typical reference values; the Certificate of Analysis (CoA) for the lot you buy governs. Amine curing agents are typically corrosive and can sensitize skin — handle per the current Safety Data Sheet (SDS). Each lot ships with CoA, TDS and SDS.
Bulk supply and RFQ
RawSource sources Hexamethylenediamine direct from producers in bulk, with CoA, TDS and SDS per lot. Tell us your resin system, cure schedule (ambient or heat) and the properties you need (pot life, Tg, flexibility, chemical resistance), and we will quote the right hardener. See selection logic in the epoxy curing agents guide.
Typical Properties
Typical reference values, not a specification; the Certificate of Analysis (CoA) for the lot governs.
| Property | Typical Value |
|---|---|
| Chemical / class | Aliphatic amine hardener / monomer |
| Cure role | Ambient cure; nylon monomer |
| CAS Number | 124-09-4 |
| Molecular Formula | C6H16N2 |
| Molecular Weight | 116.20 g/mol |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 204-679-6
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is hexamethylenediamine (HMDA) used for?
Hexamethylenediamine (HMDA, CAS 124-09-4) is mainly a nylon-6,6 monomer and is also used as an epoxy hardener and a building block for diisocyanates and polyamides.
How is bulk hexamethylenediamine supplied and quoted?
RawSource supplies hexamethylenediamine in bulk with CoA, TDS and SDS per lot. Pricing is quote-based on grade and volume; submit an RFQ with your resin system and cure schedule.
What is the REACH and TSCA regulatory status of Hexamethylenediamine (HMDA)?
Hexamethylenediamine (HMDA) (CAS 124-09-4) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 204-679-6).