Flame retardant glass fiber casing is made of high - expanded glass fiber yarn woven, and then coated with high temperature iron oxide silica gel by high temperature drying. Fire, flame retardant, heat insulation, anti oil, anti - aging, insulation, insulation, acid and alkali. Can resist the molten metal splash and flame, apply to steel mills, smelting plant, glass factory, rail transportation, large variable pressure hydraulic hose, cable, metal hose, corrugated pipe insulation protection.