18/12/2020
How to Identify The Quality of PVC Pipe?
To identify the quality of PVC pipes, there are several ways to do this:
Measurement:
1. Measure the wall thickness: Check whether the specified wall thickness is reached. Here, we must pay attention to it. Some pipes are evacuated, the wall thickness of both ends meets the requirements, but the middle wall thickness is thin, which does not meet the requirements for use, and is reduced by evacuation. cost.
2. Measure the length: Check whether the specified length has been reached, some manufacturers rely on shortening the length to reduce the price. Negative deviations are not allowed by ASTM/ ANSI/ DIN/ BS/ JIS.
Look at:
1. look at the gloss: looks good surface gloss and oily, is a high-quality product.
2. look at the color: the standard high-quality PVC-U pipe is light beige, if it looks pale, it means that the calcium powder is added excessively, some manufacturers add too many miscellaneous materials, recycled materials, resulting in a black and yellow pipe.
Weighing:
Weighing: Weigh two pipes of the same diameter, wall thickness, and length. The heavier pipe calcium powder and impurities are added too much, and the material is not pure, which does not meet the requirements.
Fall:
Use foot on the side of the pipe, Check whether it is easily crushed. Throw the PVC pipe to the ground, the broken pipe is a "high calcium tablet". To save costs and increase profits, some manufacturers have added excessive amounts of calcium powder in the production of pipes. Such pipes are cheap, but their hardness is much lower and brittle, which is a non-conforming product. High-quality PVC pipe with ankles and even rolling with the car will not flatten and will not break, and the inferior PVC pipe can be broken with the ankle.
Inspection:
1. Test report: The test report of the pipe and the test report of its health indicators should be obtained. It is best to look at the original.
2. Technical indicators;
3. Vicat softening temperature ≥ 80 ° C;
4. Longitudinal retraction rate of ≤5%;
5. There is no change in the impregnation surface;
6. drop weight impact test (0 ° C) TIR ≤ 5c / o;
7. Hydraulic test in the 20-degree environment, the ring stress is 36MPa/38Mpa, no crack after 1 hour, no leakage.
Through the above methods, you can purchase qualified PVC
