Dual wall heatshrink sleeving is also known as adhesive or glue lined heat shrink sleeving. It is a general purpose polyolefin tubing with a thermoplastic adhesive liner. The inner liner will melt and flow to seal and encapsulate the inner components, offering environmental protection. Standard shrink ratio is 3:1 but 4:1 is also available. Packaging options are 1.2 metre lengths or large reels.