It is a kind of copper foil covered laminated board formed through heat pressing after the electric industry alkali-free glass fiber dips into thermoset epoxy resins and is covered with copper foil at one side or both sides, called copper-clad laminate(CCL) .It is used for production of printed circuit board(PCB).

FR-1 copper clad laminated sheet/CCL consist of bleached wood pulp paper, impregnated with flame retardant phenolic-epoxy resin and clad with electrolytic copper foil.It has high electrical stability, good flame retardancy, good dimension stability and smoothness, good punching ability and widely used for Hi-Fi acoustic devices, color TV sets and other electronic appliances.