- ▸ Secondary aromatic-diamine chain extender/curative for cast PU elastomers (Unilink 4200 type)
- ▸ Provides controlled reactivity and high mechanical performance in cast elastomers
- ▸ Liquid MOCA-alternative diamine curative
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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N,N’-Di-sec-butyl-4,4′-methylenedianiline is a secondary aromatic diamine used as a polyurethane/polyurea chain extender and epoxy co-hardener, giving long working time and toughness. Identity: CAS 5285-60-9.
What it is
N,N’-Di-sec-butyl-4,4′-methylenedianiline (CAS 5285-60-9, a Unilink-type secondary aromatic amine) is a liquid hindered aromatic diamine. The sec-butyl groups slow its reactivity for controllable cure.
How it cures
As a secondary aromatic amine it reacts with isocyanates (PU/polyurea chain extension) and epoxies with long pot life and good toughness, color and hydrolytic stability — used in polyurea/PU elastomers and coatings.
Applications
It is used as a chain extender in polyurea/polyurethane elastomers and coatings, and as an epoxy co-hardener. Compare the cycloaliphatic analogue.
Forms, grades and handling
Supplied as a clear-to-amber liquid in drums, IBCs 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 N,N’-Di-sec-butyl-4,4′-methylenedianiline 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 | Secondary aromatic amine (chain extender) |
| Cure role | PU/epoxy; long pot life |
| CAS Number | 5285-60-9 |
| Molecular Formula | C21H30N2 |
| Molecular Weight | 310.5 g/mol |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 226-122-6
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is N,N’-di-sec-butyl-4,4′-methylenedianiline used for?
This secondary aromatic diamine (CAS 5285-60-9) is a long-pot-life chain extender for polyurea/polyurethane elastomers and coatings and an epoxy co-hardener, giving toughness and good stability.
How is bulk this secondary aromatic diamine supplied and quoted?
RawSource supplies this secondary aromatic diamine 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 N,N'-Di-sec-butyl-4,4'-methylenedianiline (Clinker 4200)?
N,N'-Di-sec-butyl-4,4'-methylenedianiline (Clinker 4200) (CAS 5285-60-9) 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 226-122-6).