Fiberglass sleeving coated with Polyurethane is manufactured with E-fiberglass braided sleeving and coated with a layer of polyurethane and then thermoset to form F grade insulating sleeving.It possesses reliable heat resistance,good qualities of dielectric,fair softness and elasticity.It can be used for wiring insulation and mechanic protection for F grade electrical machinery,electrical appliances,electrical instruments,wireless sets and domestic electrical appliances.