Most foamlike plastics and rubbers are made by mixing the rubber/plastic precursor with what is called a “blowing agent,” these are added to chemically create “air” in the mixture to make the air pockets we have in foam. There are a variety that can be used but they tend to be some kind of hydrocarbon/gasoline-like things which gives it that smell as it leaks out of the foam, particularly more so than harder plastics.
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