| http://www.w3.org/ns/prov#value | - For example, in the case of a polyoxyalkylene polyol having a viscosity of about 4,000 cP, it is preferable that the amount of the low viscosity compound added should preferably be selected so that the viscosity of the mixture may become not higher than about 3,000 cP, particularly not higher than about 2,500 cP. In some cases, a foaming agent such as a halogenated hydrocarbon is added to the abov
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