PP-R pipes (random copolymer polypropylene pipes) are plastic pipes made from random copolymer polypropylene through a gas-phase copolymerization process. They belong to the field of building materials and are primarily used in building cold and hot water systems, gas transportation, industrial fluid transport, and agricultural irrigation. This material originated in Europe in the late 1980s and became a mainstream choice for home water supply after being introduced to China in the 1990s.Generally, during water and electrical renovations, the original water pipes are replaced. Home renovation companies and merchants often recommend installing PPR pipes entirely using hot water pipes, even for areas where cold water flows. Their reasoning is that the technical parameters of hot water pipes are higher than those of cold water pipes, and the price difference is minimal, so hot water pipes are used for all waterway renovations.

Pipe Diameter The pipe diameter of PPR pipes (based on outer diameter) ranges from 20mm to 160mm. In home renovations, the main sizes used are 20mm (PPR corresponds to 4分管, which differs from galvanized pipes) and 25mm (PPR corresponds to 6分管, which differs from galvanized pipes), with 20mm being more commonly used. If budget allows, we recommend using PPR pipes with an outer diameter of 25mm, especially for cold water inlet pipes. This is because modern households are highly concentrated, with an increasing number of water-using appliances, and the likelihood of simultaneous water usage is high. Using larger pipes can help minimize issues such as low water pressure and reduced water flow.