3M™ Heat Shrink Multiple-Wall Polyolefin Tubing is a dual wall tubing that provides the advantage of integral, adhesive lined construction. This flame retardant tubing with a 4:1 shrink ratio offers insulation for 600V rated applications. The semi rigid polyolefin construction has an internal layer of thermoplastic adhesive which offers moisture seal protection in automotive and marine applications.3M Heat Shrink Multiple-Wall Polyolefin Tubing is colour coded for quick and easy identification of the wire. It provides a skintight fit and strain relief protection for electronic components, truck wire splices, wire bundles and harness breakouts. This flame retardant tubing has a heat shrinkable outer wall that is cross linked for abrasion resistance. The inner adhesive helps to maintain high flow and good adhesion characteristics. When the tubing cools down, it forms a permanent, water resistant barrier. It withstands temperatures of 67 to 230 degrees F ( 55 to 110 degrees C). UL Listed, CSA Certified and RoHS 2011/65/EU Compliant.