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 the starting resin, being greater, for example, as {HEAD ~ the proportion} of {TAIL ~ dichlorodifluoromethane} is greater in the mixed blowing agent 
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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 the starting resin , being greater , for example , as { HEAD ~ the proportion } of { TAIL ~ dichlorodifluoromethane } is greater in the mixed blowing agent
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