FSG is made of sleeving braided with non-alkali fiberglass coated with silicone resin; it is treated at a suitably high temperature. This flexible and self-extinguish silicone glassfiber sleeving possesses excellent flexibility, toughness, self-extinguishment, excellent softness. It is widely used as wiring insulator for H grade electrical machinery, domestic electrical appliances, heating electric equipment, and electric apparatus, and also for the protection collected strands of wire.