| http://www.w3.org/ns/prov#value | - The surface of copper foil is roughed by conducting etching treatment by means of a commercially available etching processor (made by MEC; CZ processor), and a 35-??m thick insulating film mainly composed of an epoxy resin is applied to both sides of the core substrate, followed by curing under the conditions of 170??? C.???1.5 hours to form the insulating layers.
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