The Black Stallion B-WFG35 35 oz. Heat Cleaned Fiberglass offers excellent heat resistance. Fiberglass offers excellent heat resistance and resists melting up to 1,000°F. The B-WFG35 is made withg Tan 35 oz. heat cleaned fiberglass and is .080" thick. Finished blankets include grommets on all sides, making this ideal for MEDIUM DUTY applications, protecting against sparks and spatter.