- ▸ Strong blowing/balanced tertiary-diamine catalyst for rigid and flexible PU foam
- ▸ Drives fast cream/rise in spray and pour rigid insulation foam
- ▸ Co-catalyst for improved flow and surface 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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Tetramethyl-1,6-hexanediamine (TMHDA) is a blowing-type tertiary diamine catalyst for polyurethane, used to promote the water-isocyanate reaction with a longer-chain backbone. Identity: CAS 111-18-2.
What it is
TMHDA (CAS 111-18-2) is a liquid permethylated 1,6-diamine. The longer hexane spacer gives it a distinct reactivity/volatility profile among the tetramethyl diamine catalysts.
How it catalyzes
It accelerates the blow reaction and overall cure; the longer backbone lowers volatility relative to shorter diamines, which can help emission/odor in some systems. Balanced with a gelling catalyst.
Applications
TMHDA is used in polyurethane foam as a blowing/co-catalyst, with a gelling catalyst such as TEDA. Compare TMPDA.
Forms, grades and handling
TMHDA is supplied as a clear liquid in drums, IBCs and bulk. Properties are typical reference values; the Certificate of Analysis (CoA) for the lot you buy governs. Amine catalysts are typically corrosive and have a strong odor — handle per the current Safety Data Sheet (SDS). Each lot ships with CoA, TDS and SDS.
Bulk supply and RFQ
RawSource sources N,N,N’,N’-Tetramethyl-1,6-hexanediamine direct from producers in bulk, with CoA, TDS and SDS per lot. Tell us your system (flexible/rigid foam, CASE), the reaction balance you need (gel vs blow), and any low-emission requirement, and we will quote the right catalyst or blend. See the full range and gel/blow selection logic in the polyurethane catalysts guide.
Typical Properties
Typical reference values, not a specification; the Certificate of Analysis (CoA) for the lot governs.
| Property | Typical Value |
|---|---|
| Chemical / class | Polyurethane blowing catalyst (tertiary diamine) |
| Catalyst action | Blowing |
| CAS Number | 111-18-2 |
| Molecular Formula | C10H24N2 |
| Molecular Weight | 172.31 g/mol |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 203-842-9
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is tetramethyl-1,6-hexanediamine (TMHDA) used for?
TMHDA (CAS 111-18-2) is a blowing-type tertiary diamine catalyst for polyurethane foam, with a longer backbone that lowers volatility; it is balanced with a gelling catalyst.
How is bulk TMHDA supplied and quoted?
RawSource supplies TMHDA in bulk with CoA, TDS and SDS per lot. Pricing is quote-based on grade and volume; submit an RFQ with your PU system and the gel/blow balance you need.
What is the REACH and TSCA regulatory status of N,N,N',N'-Tetramethyl-1,6-hexanediamine (TMHDA)?
N,N,N',N'-Tetramethyl-1,6-hexanediamine (TMHDA) (CAS 111-18-2) 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 203-842-9).