Phenolic resin cotton cloth is made out of insulation paper combined with phenol resin, and then processed under high heat and pressure. It endures impact, high machine strength, often used to make gear and axles. Green or yellow glass epoxy is made out of glass epoxy cloth and epoxy resin, and then processed under high heat and pressure. It also endures impact, has high hardness, provides very good electrical insulation, often used to PCB electronics factory, and used to make electronic parts.