| http://www.w3.org/ns/prov#value | - In this method, it is important to have a satisfactorily long impregnation time.Examples of volatile foaming agents to be used for producing expandable, foamable pellets or particles of the present invention, include aliphatic hydrocarbons, such as propane, butane, pentane, hexane, heptane and petroleum ether; alicyclichydrocarbons, such as cyclopentane and cyclohexane; and halogenated hydrocarbon
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