They are made of a high quality irradiated polyolefin material with excellent resistance to chemical attack. Particularly suitable for ensuring dielectric and anti-corrosion protection; waterproof product. The presence of mastic that covers the entire internal wall of the sheath ensures perfect adhesion to the pipe. Operating temperature: -40° to +135°C Shrinkage temperature: +125°C Retraction ratio: 3/1 Longitudinal retraction is less than 10%