Si Nuo. 10 1-68-8

Diphenylmethane diisocyanate is abbreviated as MDI. There are 4,4'-MDI, 2,4'-MDI, 2,2'-MDI and other isomers, among which 4,4'-MDI is the most widely used. White to light yellow melts and contacts with solids, and has a pungent smell when heated. Relative density (50 ℃/4℃) 1. 19, melting point 40 ~ 4 1℃, boiling point156 ~158℃ (1.33kpa). Soluble in acetone, carbon tetrachloride, benzene, chlorobenzene, kerosene, nitrobenzene, dioxane, etc. It is toxic, its vapor pressure is lower than TDI, and it is less irritating to respiratory organs. The maximum allowable concentration in the air is 0.20mg/m3.