Aerocel-CG Tube and Sheet insulation is a flexible, closed cell and light weight elastomeric material designed for insulating liquid cooling and heating lines. Aerocel-CG is available in 3/8", 1/2", 3/4" and 1" thickness, and popular sizes up to 1 1/8" ID. The closed-cell structure of Aerocel Pipe insulation makes it an efficient insulation.Aerocel-CG is manufactured to consistently provide actual values on these key performance criteria for mechanical system insulation:Thermal Conductivity: 0.245Water Vapor transmission: Fire Rating: F/S 25/50Aerocel-CG Pipe Insulation, in 3/8", 1/2", 3/4" and 1" thicknesses has a flame spread rating of 25 or less and a smoke developed rating of 50 or less as tested by ASTM E 84 Surface Burning Characteristics of Building Materials.Features: Best UV Resistance Low thermal conductivity Easy to install 25/50 rated Versatile, for heating, AC, plumbing