3M FP-301VW Heat Shrink Tubing is a thin wall tubing that provides a balance of electrical, physical and chemical properties. This tubing has a 2:1 shrink ratio and provides insulation for 600V rated applications. It has highly flame retardant, flexible polyolefin construction for moisture seal protection.3M Heat Shrink Tubing FP-301VW isperfect for flame retardant applications requiring UL VW 1 and CSA OFT, fire resistant wiring. It withstands temperatures of 67 to 275 degrees F ( 55 to 135 degrees C). UL Listed, SAE AS23053/5, Class 3, CSA Certified and RoHS 2011/65/EU Compliant.