how to choose PVC pipe?

September 28, 2021

Most households use buried burial lines when laying electrical wiring. This way to use flame-retardant PVC pipe, because the price of PVC pipe than ordinary pipe expensive 56 yuan per meter, many owners of the purchase of pipe line tube is mostly ordinary thin plastic pipe, use this pipe once the electricity line leakage Can not afford fire protection. In many home renovations, flammable materials such as wood and fabrics are used extensively as interior decoration materials. They are often not fireproofed when used, and the unattractive power switches in the room are closed with cabinets or decorative frames. These are hidden dangers in fire safety.

The water-supply hard PVC pipe, which is abbreviated as PVC-U water supply pipe, is made of PVC resin as the main raw material, added with special auxiliaries, and extruded through an extruder. However, hygienic PVC resin powders with low residual vinyl chloride units (VCM) are required, and non-toxic or low-toxic (organic tin or low-lead) thermal stabilization systems are used to ensure the hygienic properties of the pipes. VCM is a carcinogenic substance. China's stipulated sanitary PVC resin, VCM residue is not more than 5 × 10-6, lead is a cumulative toxin, especially for young children (under 6 years old), fetus, pregnant women's health Larger.

Different from PVC-U drainage pipe, the pressure resistance of PVC-U water supply pipe is its main mechanical index. The existing mechanical and equipment factors that affect the pressure resistance performance of the pipe, as well as raw material and formulation factors, must also consider the corresponding adjustment of the process. . Such as the extrusion screw and the barrel gap should not be too large; a larger amount of feed and greater compression ratio; design a reasonable formula, and appropriate reasonable process adjustments, the plasticity is controlled at 60% to 70% .

Although the rigidity of the PVC-U water supply pipe itself is large, and its low temperature and pressure resistance is excellent, the pressure stress at 20°C can be greater than 36 MPa. It is the largest amount of water supply plastic pipe used in construction on the market, but its high temperature pressure resistance It is poor, so it can only be used in cold water or low temperature hot water piping systems below 45°C.

How to buy:

The UPVC water supply pipe is connected in the same manner as the drain pipe, and is generally glued. Select UPVC water supply pipe should consider the following aspects:

1. The user chooses to first apply the macroscopic inspection of appearance and size, such as whether the circumferential wall thickness is uniform and whether the wall thickness is thick enough.

2. A test report of the tube and a test report of the health indicators should be obtained. It is best to read the original.

Technical indicators (according to GB/T10002.1-2006)

Vicat softening temperature ≥80°C

Longitudinal retraction rate ≤ 5%

Dichloromethane impregnated surface without change

Drop weight impact test (0°C) TIR ≤ 5

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Author:

Mr. Zheng

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zheng@rmiplast.com

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