HFS Heat-treatment fiberglass sleeving The heat-treatment fiberglass sleeving is manufactured by non-alkali fiberglass braided sleeving ,and its wax is been out of at high temperature, then impregnated with a little adhesive of silicone alkyl. It remain fine and circular profile after heat treatment. It possesses the characteristics of high tensile strength and heat-resistance. It can be used as an excellent insulating material for the wiring of motor, electrical appliances and insulating protection for domestic electrical appliances.