Abstract: The present invention relates to an improved essentially closed cell polyurethane foam comprising the reaction product of at least one polyol with at least one isocyanate, in the presence of water to provide a carbon dioxide blowing agent, the improvement comprising said reaction being effected in the presence of a catalyst system consisting essentially of N,N,N',N", N"-pentamethyl-diethylenetriamine and triethylene diamine in order to provide a polyurethane foam characterized by enhanced shrinkage resistance. Also claimed is a process for producing this foam.

Abstract: In a foam dispensing head for discharging foam in a low pressure system there is provided at least first and second orifice rods rotatably insertable within receiving bores cooperative respectively with adjacent first and second mix component infeed ports, each rod having a plurality of predetermined sized orifices therein through which the mix components flow under pressure to a mixing chamber in impinging fashion to selectively permit the desired flow rate of mix components to be maintained into the mixing chamber so as to insure proper admixing of the foam at selected predetermined flow rates.

Abstract: A select semi-rigid polyurethane foam composition is described for use in packaging fragile or shock-sensitive objects. The foam composition is prepared from a very select reaction mixture which is characterized by high levels of water and an organic foaming agent, and a relatively low reaction mixture NCO/OH index of from about 30 to about 60.