| http://www.w3.org/ns/prov#value | - In order to adjust the thermal expansion coefficient ??M of the coating material layer, it is necessary to change the material blend, the porosity and the materials; and with respect to the method, not particularly limited, examples thereof includes: a method in which the above-mentioned foaming agent and resins, such as a thermoplastic resin and a thermosetting resin, as well as organic balloons,
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