3M Heat Shrink Thin-Wall Tubing, FP-301, black, 1/4 in x 100 ft (0.64 cm 30.48 m) spool 3M Heat Shrink Thin-Wall Tubing is a heat-shrinkable, flexible polyolefin tubing that offers an outstanding balance of electrical, physical and chemical properties for a wide variety of industrial and military applications. Product Information Brand 3M Part # 7100022418 Origin Country USA Product Type Enclosures Product Information2:1 shrink ratioDesigned to withstand elevated temperatures to 300?C (572?F) for short periods of timeFlame-retardant tubing is rated for 600V applicationsFlexible and split resistantRated for 135?C (275? F) continuous operationRated for 600V applicationsSuggested ApplicationTypically used as shrink-fit electrical insulation over cable splices and terminationsUsed for lightweight wire harness covering, wire marking, wire bundling, component packaging and fire-resistant covering