Fr-4 epoxy glass cloth laminated sheet (fr4 sheet, fr4 insualtion parts)is made of electrical non-alkali and non-wax cloth impregnated with epoxy resin by procesing under pressure and heat.It is insulation class b(130 degree).With high mechanical properties at medium humidity and good dielectric stability at high humidity, it is applied to electricmotors, mechanical lines, electron lines and electrical appliancelines, pcb test, transformers, ect.Fr4 is flame retardant
