Seamless Rubber Pipe Insulation, Flexible Closed Cell, Black w/blue ink. An Enviormenally Friendly, CFC Free, Flexible elastomeric thermal insulation. Used to retard heat gain & prevent condensation or frost formation on refridgerant lines, cold water plumbing and chilled water stystems. Retards heat flow for hot water plumbing, liquid heating, dual temperature piping and many solar systems. Use indoor, outdoor, underground. Resistance to moisture and vapor flow. Flame & Smoke Rating. CFC-free.