HDI Trimer Isocyanurate


HDI isocyanurate trimer CAS # 3779-63-3

Molecular weight 504.6
Isocyanate, % 25 (theoretical)
Equivalent weight 168.2
Toxicity/Safety See MSDS of manufacturer, also check for free HDI monomer content.
See also under links to other web sites.


 TYPICAL PROPERTIES (lower viscosity grade)

Appearance Clear, slightly yellow liquid
NCO content, %
Viscosity @ 25C, mPas 1300-2200
Free HDI monomer, % (based on solids) 0.7 maximum
Equivalent wt., avg. (as supplied) 181
Specific gravity @ 25C 1.12
Weight per gallon, lb. @ 25C 9.3
Flash point (Setaflash) 385F (196C

Most commercial products contain various amounts of higher oligomers. These products have higher viscosity and also a functionality of >3. Commercial products may also contain asymmetric isocyanurate structures.

Regulatory Inventory
CAS REGISTRY NUMBER # 3779-63-3 NAME : 1,3,5-Triazine-2,4,6(1H,3H,5H)-trione, 1,3,5-tris(6-isocyanatohexyl)
DSL Canada Yes
EINECS Europe EINECS No. 223-242-0 Yes
ENCS Japan   Yes
ECL Korea ECL Serial No. KE-34831 Yes
AICS Australia   Yes
The fact that a compound is not listed under a specific CAS # in a countries inventory does not mean this compound cannot be used, it can be an exempt compound or polymer which does not require listing, or it can be listed in a different category. Ask your supplier.
Other names:
(2,4,6-trioxotriazine-1,3,5(2H,4H,6H)-triyl) tris(hexamethylene) isocyanate, 
1,3,5-Tris(6-isocyanatohexyl)-1,3,5-triazine- 2,4,6-(1H,3H,5H)-trione 
Hexamethylene diisocyanate cyclic trimer
Hexamethylene diisocyanate isocyanurate
Isocyanic acid, (2,4,6-trioxo-s-triazine-1,3,5(2H,4H,6H)- triyl)tris(hexamethylene) ester
Isocyanurate-based hexamethylene diisocyanate trimer
Commercial Products or generic terms used for products. For manufacturer see Isocyanate MFCT.
Desmodur N-3200 Desmodur N-3300 Luxate HT2000

Last edited on:

July 06, 2006

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