... base, Brass base, steel base, Ceramic and Teflon Board. Typical Feature . Standard dimension: 490x8857; 490mm 600x8857 ... ; 500mm (optional dimension for discussion) . Standard thickness: 1.0, 1.5 ... , 2.0, 3.0 mm(optional dimension for discussion) . Copper foil thickness: 35um, 70um, 105um ... base, heat sinker Board pcb and multi-layer Circuit Board design