is used for commercial wiring and for applications in the electronic and telecommunications industries. It is a flame retardant, flexible tubing that is used to insulate and protect electrical connections, providing an environmental seal which can be applied by shrinking with a heat gun. It has a nominal shrink temperature of 70°C, an operating temperature range of -55°C to 125°C, and a two-to-one shrink ratio. The tubing is made from a cross-linked modified polyolefin material, providing good electrical and chemical properties, along with excellent resistance to oil, water and abrasion. Its low-temperature flexibility allows for ease of installation in applications where cold flexibility is important. The transparent tubing is UL Listed and CSA certified. The Sleeves 2:1 ratio manufactured by HellermannTyton are available in light gray and black, depending on the application. These types of heat shrinkable sleeves are used to join or form insulation coverings on electrical cables or wires, as well as protect against abrasion and as an environmental seal. The sleeves are UL Recognized and CSA certified, and their nominal shrink temperature is 69°C. They offer a two-to-one shrink ratio and an operating temperature range between -55°C and 125°C. The sleeves are made from modified polyolefin and include a cross-linked matrix, providing good electrical and chemical properties, along with excellent resistance to oil, water, and abrasion. The combination of the 309-40163 Heat Shrink Tubing and Sleeves from HellermannTyton provide reliable protection and insulation for electrical connections, wiring, and cables. It has a strong temperature range and a quality shrink ratio in order to guarantee efficient installation and protection for electronic components and networks in a wide range of applications.