| http://www.w3.org/ns/prov#value | - Although the type of the foaming agent and the volatile substance is not particularly limited, in terms of handling properties and foaming efficiency, an organic volatile foaming agent is preferred which has a boiling point of from 5 to 60 degree C. Exemplary organic volatile foaming agents include trichloromonofluoromethane, dichrolomonofluoromethane, methylene chloride, trichlorotrifluoroethane,
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