| http://www.w3.org/ns/prov#value | - An epoxy resin equivalent to FR-4 or FR-5 having a thickness in the range of 10 to 100 ??m, for example, is used as the thermosetting resin, and the rigid sheets are for example copper foil, stainless steel foil, a fluorine-based resin sheet, or a polyimide film with a thickness in the range of 10 to 100 ??m.
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