HSFR series flame-retardant heavy-wall heat-shrinkable tubing. Insulates and protects electrical splices and terminations. High-impact and abrasion resistance. Thermoplastic adhesive liner. Rated for 600V, 90°C continuous use. Continuous operating temperature: -55°C to 110°C. Shrink temperature of 120°C. Meets: UL and CSA standards, ANSI C119.1, western underground guide Nos. 2.4, 2.5, MIL-DTL-23053/15, IEEE 383 vertical flame test, ANSI C37.20.2, ICEA S-19-8 and NEMA insulation thickness requirements.