Anhui Province: sampling rate of plastic pipe products is 95%

The main problems found in the spot check are: 1. The density is unqualified, reflecting the fact that the filling amount of calcium carbonate is still too high in the drainage pipe products. 2. The tensile yield strength is unqualified. The tensile yield strength is one of the important indexes of the mechanical properties of the pipe. It reflects the basic strength of the pipe. When a certain proportion of filler is used, the tensile yield strength of the pipe does not change much, but if the filler is used in a large amount, the interface between the filler particles and the substrate is disengaged during the stretching process. After the opening, holes are formed, and the larger holes cause rapid fracture of the matrix material, and the test shows that the material breaks without yielding. Usually in the processing of pipes, the appropriate fillers and addition amount are selected to make the products have suitable impact resistance and breaking strength, but the excessive use of fillers must affect the performance of the products. Products with unsatisfactory tensile yield strength will be prone to breakage, breakage, cracking, etc. during installation and use. Once these inferior products flow into the construction project, they will bring greater quality hazards.