is ready to pull in 5 minutes or less in the above example the isocyanate and polyol components have typical properties as follows ______________________________________property wet specification results______________________________________weight lbs gal astm d 1475component isocyanate 10 5 u00b1 0 2component polyol 9 0 u00b1 0 2solids by weight astm d 1353 100 mix ratio isocyanate polyol 1 1 by volumeviscosity lv4 60 rpmcomponent isocyanate 110 cpscomponent polyol 800 cps______________________________________ in the isocyanate component various isocyanates polymeric and monomeric may be employed the nco functional groups vary from two to eight products of the above isocyanate may also be employed with poliols and amines to produce prepolymers having terminal groups with nco functionality the polyol component employs polyalcohols or amines having oh or nh 2 functional groups from 2 to 8 that react with isocyanates also usable are unsaturated polyester resins with vinyl monomers that provide reactive sites for hybrid reactions in addition to 0h sites liquid modifiers may be incorporated as plasticizers that do not react as well as unreactive solid modifiers for fillers foaming or blowing agents may be used such as low boiling point liquids or low temperature decomposing substances catalysts may be employed or organometals and amines that promote reactions of oh.