Medium and heavy wall adhesive-lined heat shrink tubing is made of flame retardant polyolefin extruded with a layer of hot melt adhesive inside. It is widely used in cable splice protection and metal pipe corrosion protection. The outer polyolefin and the inner thick layer of hot melt adhesive can provide long-term and reliable protection for objects in the outdoor environment. The continuous operating temperature is suitable for Minus 55°C to 125°C.The shrink ratio can reach 3.5:1.