{TAIL ~ The maximum useful proportion} of such blowing agent in composition of flowable, foamable gel is in the order of about 0.12 to 0.18 gram moles per 100 grams of {HEAD ~ the starting resin}, being greater, for example, as the proportion of dichlorodifluoromethane is greater in the mixed blowing agent 
{ TAIL ~ The maximum useful proportion } of such blowing agent in composition of flowable , foamable gel is in the order of about 0.12 to 0.18 gram moles per 100 grams of { HEAD ~ the starting resin } , being greater , for example , as the proportion of dichlorodifluoromethane is greater in the mixed blowing agent
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