Standard Black Rubber insulation is a flexible, closed cell and light weight elastomeric material designed for insulating cooling and heating refrigerant lines. The insulation is produced in compliance with specification ASTM C 534-88. The service temperature range is from -70° F to 257° F. The insulation has a thermal conductivity K value of . 25 at the mean temperature of 75° F in accordance with test method ASTM C 177. The insulation is weather and ultraviolet resistant. It also has an ASTM E- 84 25/50 fire and smoke rating.