Product Description: insulated pipes for collectively have fiberglass insulation casing, PVC casing, heat shrink tubing, Teflon sleeve, ceramic casing, yellow wax into a glass fiber insulation casing, using alkali. glass tube coated with modified plasticized polyvinyl chloride resin tube made of electrical insulation. It has excellent flexibility and elasticity and good dielectric properties and chemical resistance, suitable for wiring insulation and mechanical protection of electrical, electronics, instrumentation, radio and other devices. Temperature: 130 degrees Celsius (Class B) Breakdown voltage: 1.5KV, 2.5KV, 4.0KV colors: green, red and blue color also qualities tube threaded pipe.