The testing of PP-R pipes and fittings is primarily governed by the national standard GB/T 18742.2-2017, Polypropylene Piping Systems for Hot and Cold Water - Part 2: Pipes. Officially implemented on May 1, 2018-replacing the 2002 edition-this standard stipulates the technical requirements, test methods, and inspection rules for PP-R pipes.
Key testing parameters include dimensional specifications (wall thickness deviation controlled within ±0.15 mm, with strict standards for nominal outer diameters); longitudinal reversion (≤2%); hydrostatic strength (must withstand a pressure of 16 MPa at 20°C for one hour without rupture, and pass a 165-hour hydrostatic strength test at a high temperature of 95°C); simply supported beam impact strength (failure rate ≤10%); ash content (≤1.5% for pipes); melting temperature; oxidation induction time (≥20 minutes); and light transmittance (≤0.2%; if this limit is exceeded, the product must be marked "Not suitable for exposed installation"). Furthermore, sanitary performance must comply with GB/T 17219-1998, Standard for Safety Evaluation of Equipment and Protective Materials in Drinking Water System.
Testing the quality of raw materials is also critical, involving indicators such as molecular weight (ranging between 300,000 and 800,000) and melt mass-flow rate (the pipe's MFR should fall within the range of 0.2–0.4 g/10 min). Regarding raw material purity, it is strictly required that only random copolymer polypropylene (PP-R) be used, with the addition of recycled material limited to no more than 10%.
For products such as PP-R aluminum-plastic steady-state composite pipes, testing must also adhere to relevant industry standards (e.g., CJ/T 210-2005, *Random Copolymer Polypropylene (PP-R) Aluminum-Plastic Steady-State Composite Pipes*).