... 3.Closed-cell flexible 4.Fire proof, MoistureproofBellsafe-flex adopting NBR/PVC as the main raw material, is an environmental product.It ... sheet, rubber sponge sheet/board/ Pipe rubber foam, fireproof apply in HVAC system Specification: Main material : NBR/PVC ID size:1/4", 3 ... 2mcompetitive price and high quality can beat any competitorPacking photo : NBR/PVC Insulation tube easy for installation