HDI dimer


Hexamethylene diisocyanate dimer CAS # 23501-81-7

Molecular weight 336.39
Isocyanate, % 21.8
Equivalent weight 183
Toxicity/Safety See MSDS of supplier
Solids, wt. % 100
NCO content, % 21.1-22.5
Viscosity @ 23C, mPas 90-250
Color, HAZEN 80 maximum
Equivalent wt., avg. (as supplied) 193
Specific gravity @ 20C 1.14
Weight/gallon, lb. @ 25C 9.5
Free HDI monomer,% (based on solids) 0.5 maximum
Flash point (Setaflash)  C  (F) 185 (365 )

Data from Bayer and Lyondell

Regulatory Inventory
CAS REGISTRY NUMBER # 23501-81-7,  NAME : 1,3-Diazetidine-2,4-dione, 1,3-bis(6-isocyanatohexyl)-
DSL Canada Yes
EINECS Europe EINECS No. 245-699-5            Yes
ENCS Japan   Yes
ECL Korea ECL Serial No. KE-10911 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-dioxo-1,3-diazetidine-1,3-bis(hexamethylene) diisocyanate ,
Hexamethylene diisocyanate cyclic dimer
Hexamethylene diisocyanate dimer
Isocyanic acid, (2,4-dioxo-1,3-uretidinediyl) bis(hexamethylene) ester
Commercial Products or generic terms used for products. For manufacturer see Isocyanate MFCT.
Desmodur N-3400 Luxate HD100 - HDI Dimer
Some of these product names might not be commercial anymore, the product names still might be in old formulations

Last edited on:

July 06, 2006

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