【 Building materials network 】In 2012, the Provincial Administration for Industry and Commerce of Sichuan Province PVC -U Plastic pipe The quality of timber commodities was monitored directionally, and 29 of the 39 batches randomly inspected were unqualified.

Guizhou Provincial Physical and Chemical Testing Analysis and Research Center was entrusted to be responsible for this monitoring. A total of 34 commodity operators in the circulation field in Guiyang, Zunyi, Liupanshui, Anshun, Tongren, Bijie, Qiandongnan, Qiannan and Qianxinan were randomly sampled. The places involved in the monitoring were comprehensive markets, professional markets, wholesale enterprises and other Business premises, 39 batches of samples were randomly selected.

After testing, "Lanchen Management Business Department" pin PVC-U row with the nominal "Lanzhichen" brand produced by "Sichuan Lanchen Pipe Industry Co., Ltd.", specification of "Φ 50 (Type B)", production date/batch number of "2012/04/09" Water pipe 29 batches of goods are unqualified.

"The unqualified items are density, falling weight impact test, wall thickness, hydrostatic test and marks," said the relevant staff of the bureau. Density is a characteristic of substances, and is one of the important indicators for comprehensive evaluation of the internal quality of PVC-U plastic pipes. If the density is not up to the standard, it will lead to the increase of the pipe density, the brittleness of the pipe, etc., which will affect the mechanical properties of the pipe; The consequence of unqualified drop hammer impact is that the bearing capacity and service life of the product decrease; Unqualified wall thickness will directly affect the physical and mechanical properties of pipes, not only pipe fitting Good connection, and may reduce the compressive strength of the connection, leaving The Conduit Hidden danger of fracture and leakage.