Aerocel-SSPT Tube and Sheet lnsulation 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" and 1" wall in popular I.D. sizes up to 6" IPS. The closed-cell structure of Aerocel Pipe lnsulation makes it an efficient insulation