For HDPE pipe, it is high density polyethylene pipe with milky white surface. It also has good corrosion resistance to most household and industrial chemicals, and has excellent insulation characteristics, making it perfect for wire and cable at a low temperature and still maintained a good character.
For PPR pipe, it has heat resistance and corrosion resistance which is stable that can be used for about long-term durability according to standards.PPR pipes can be put inside the wall or deep bore. But for construction, it demands higher skills and requires specialized tools and professional knowledge in construction in order to guarantee the system's security.
The HDPE has a stable plastic phase and show a perfect ductile behavior. Meanwhile the PPR have a short plastic phase and show similarities to an old HDPE pipe tendency. It is shown that the PPR has reverse characteristic pressures at the opposite of the HDPE ones.
