Working temperature: -55ºC ~ 155ºC;2. Shrink temperature: 84ºC ~ 135ºC;Flame-retardant heat shrinkable tube is made of eco-friendly cross-linking polyolefin material under irradiation.It has wire harness protection, electrical insulation of connecting parts,also has electrical insulation, rust prevention and corrosion prevention of welding spot, mechanical protectionProtection etc.The product has the characteristics of high temperature resistance and flame retardant .It has passed UL, RoHS, Reach certifications for 600V.