Insulation pipe Polyethylene is a flexible plastic foamed insulation that is widely used to prevent freezing of domestic water supply pipes and to reduce heat loss from domestic heating pipes. Pre-Slit Polyethylene Pipe Insulation Hinged with Self-Sealing Lap Fiberglass Pipe Insulation Pre-Slit and Pre-Glued with Overlap NBR-PVC Pipe Insulation Pre-Slit and Pre-Glued Polyethylene Pipe Insulation Flexible EPDM Pipe Insulation Unslit NBR-PVC Pipe Insulation Rigid Closed Cell Glass Pipe Insulation Unslit Halogen-Free NBR-PVC Pipe Insulation