Depending on the starting proportion of blowing agent, {HEAD ~ the resulting foam products} of this invention have {TAIL ~ densities} from about 1.5 to about 20 pounds per cubic foot , those having densities from about 1.5 to about 6 pcf being called low density foams herein 
have
Depending on the starting proportion of blowing agent , { HEAD ~ the resulting foam products } of this invention have { TAIL ~ densities } from about 1.5 to about 20 pounds per cubic foot , those having densities from about 1.5 to about 6 pcf being called low density foams herein
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