are known in the art the present invention uses non halogenated compounds to give a fast foam formation as well as to produce the necessary density and strength the water immiscible additive is an aromatic petroleum hydrocarbon agent exxon product escopol a 135 which is a blend of hydrocarbons from petroleum refining catalysts are also known in the art and are important in facilitating the foaming reaction in the preferred embodiment a low molecular weight polyglycol catalyst is used for example dow e200 an important characteristic of a catalyst is the foam formation time sequence the sequence involves control of the reaction times to regulate the mix of material and the gel process to maintain the specific strength for complete expansion both the first and second components of the present invention are pre mixed at an appropriate time and temperature before the components are mixed together the pre mixing allows for suitable foaming when the components are subsequently mixed together the rise and skin time end just before the expansion time is completed thus the rise and skin times end at approximately 140 seconds the exotherm expansion time starts at about 30 seconds and finishes at about 150 seconds it is also known in the art of preparing plastic foams that solid extenders and solid fillers can be advantageously used to reduce cost and achieve desirable characteristics the use of such fillers and extenders consistent with the obtaining of the necessary foam characteristics is contemplated in this invention indeed solid fillers or extenders which serve.