Aerocel EPDM Tube and Sheet insulation is a flexible, closed-cell and light weight EPDM* based elastomeric material designed for insulating liquid cooling and heating lines. 3/8", 1/2", 3/4", 1" 1-1/4", 1-1/2" and 2" wall in popular I.D. sizes from 1/4" ID up to 16" ID. The closed-cell structure of Aerocel Pipe insulation makes it the most efficient elastomeric insulation.Aerocel EPDM is manufactured to consistently provide tested values - not theoretical calculations - on these key performance criteria for mechanical system insulation:Thermal Conductivity: 0.245Water Vapor transmission: 0.03Fire Rating: Will not contribute significantly to fire (simulated end-use testing).Aerocel Pipe insulation in 3/8", 1/2", 3/4", 1", 1-1/4", 1-1/2" and 2" 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: UV Resistant Low thermal conductivity Easy to install 25/50 rated through 2" wall Versatile for heating, AC, refrigeration and plumbing EPDM Rubber Moisture Resistant