Aeroguard Polyethylene Pipe Insulation. A closed cell, low density, polymer based and chemically inert pipe insulation, which is self-sealing.Aeroguard Pipe Insulation is a specially formulated flame retarded closed cell formed polyolefin tubing with excellent thermal insulating capabilities. It is widely used to reduce heat loss, control condensation and help maintain cold lines and reduce plumbing noise. Aeroguard is employed over cold and hot water systems, refrigeration and air conditioning lines, line set tubing, condenser coils, connection and distribution lines, solar energy systems, underground lines and a broad range of other insulating applications.