Polyethylene (PE) is a thermoplastic material produced from the polymerization of ethylene.
Polypropylene (PP) is the lightest weight piping material with very good chemical resistance, even to many organic solvents.
the primary method of joining PP piping systems is with heat fusion, though mechanical joints can be used.
PPR pipe is a straight and rigid cylindrical pipe made from polypropylene random copolymer plastic produced by continuous extrusion process. They are usually green or white in color and range in diameter from 20 mm to 110 mm, making the pipe walls thicker than PVC.