... Test. Fiberglass insulation sleeving is braided from E-glass fiber,then coated with different materials and treated under different circumstances.Widly used ... :Insulation Sleeving,Electrical Coated Fiberglass Sleeving,inside Rudbber outside Fiber,Fiberglass Sleeving Coated with Silicone Rubber,Silicone Rubber Coated Fiberglass Sleeving,etc ...