HellermannTyton's 321-25010 heat shrinkable tubing is a low cost, 4:1 polyolefin-based product that is designed to meet a variety of insulation, protection, and strain relief requirements. It features a thick wall design with a special adhesive lining that melts when heated, forming an impervious seal that is water tight and protects against abrasion and chemicals. The black 115/30 tubing has a UL VW-1 rating, offers superior flexibility and shrink ratio, and has a temperature range of -55 degrees C to 135 degrees C. This tubing is ideal for covering leads or connections, making water-tight seals, or general insulation requirements in industries such as automotive, aerospace, and telecommunications.