The foam blocks were produced by mixing the R and T components for 1 to
3 minutes, using a Conn-type mixing impeller fitted to a high speed airdriven
stirrer. The required amount of the foaming mixture was then
weighed into the preheated mold to arrive at the desired density. The
filled mold was allowed to remain at room temperature for'20 to 30 minutes
and then the foam was cured for 8 hours at 325°F.