UNE 20-620 Pt.2-3-1993 Base materials for printed circuits. Part 2: Specifications. Specification No. 3: Epoxide cellulose paper copper-clad laminated sheet of defined flammability (vertical burning test)
The purpose of this standard is to establish the values of the characteristics required for laminates composed of epoxy resin and cellulose paper laminated with copper on one or both sides, with a thickness between 0.5 mm and 6.4 mm, with defined flammability.