Constructional material

Claim 1

A synthetic resin based substitute for plaster of paris medical bandaging or splinting material enclosed in a moisture-free and moisture impervious package comprising (a) a flexible fiberglass substrate coated or impregnated with (b) a reactive one-component system which is based on an aromatic polyisocyanate which: (1) is free of oxycarbonyl isocyanate groups, urethane groups, urea groups, biuret groups and allophanate groups; (2) contains less than about 1% by weight of volatile components which can be removed at 12 Torr and 20° C. in one hour; (3) renders said impregnated or coated flexible fiberglass substrate into a rigid self-supporting structure of comparable mechanical strength to plaster of paris materials free of extensive foaming by reaction with water after forming into a planar or hollow configuration; and (4) contains a sufficient amount of a catalyst for the reaction of isocyanate groups with water to give it a hardening time suitable for a substitute for plaster of paris medical bandaging or splinting materials, said impregnated or coated fiberglass substrate remaining formable in storage.