| http://www.w3.org/ns/prov#value | - . (at a temperature of 200??? C.) and which will not undergo chemical changes such as decomposition, exothermic change, and endothermic change at a temperature less than 300??? C., into 100 parts of said high density polyethylene; blending therein 2-8 parts of ethylene-propylene copolymer of melt flow index 3.0-4.0; heating and mixing the same; adding a gaseous foaming agent under pressure, and ex
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