| http://www.w3.org/ns/prov#value | - (b) an environmentally friendly normally gaseous polyfluorocarbon blowing agent devoid of halogen substituents other than fluorine and comprising a major proportion by weight of HFC-134, said B-side composition having a relatively low or no water content; such that the total water content corresponds to less than about 25 mole percent and the polyfluorocarbon blowing agent to more than about 75 mo
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