an improvement is provided in the compression molding of lignocellulosic composite articles , such as particle or flake board , in which polyisocyanate binder systems are employed , the improvement being the provision of a novel functional polysiloxane - hydroxyle substituted mono - carboxylic acid or metal salt - isocyanate terpolymer as a release agent on the mold surface or surfaces to give multiple release . optionally , organopolysiloxane fluids may be employed along with the terpolymer release agent as a diluent .