1, the amount of wall thickness: see PVC hose to achieve the required wall thickness, here we must pay attention to that, some PVC hose is evacuated tube, both ends of the wall thickness to meet the requirements, but the middle wall thickness is thin, did not meet the requirements, while through the pumping time Ways to reduce costs.
2, the length of the length: to see if the PVC hose reaches the specified length, some manufacturers reduce the length by reducing the price. According to GB/T10002.1-2006 regulations do not allow negative deviation.
1, to see the gloss: PVC hose shiny surface looks good oily products belonging to high quality.
2. Look at the color: The standard high-quality PVC-UPVC hose is light beige. If the white piping shows that the calcium powder is over-absorbed, some manufacturers will make miscellaneous materials and recyclable materials to make the PVC hose black and yellow. .
Third, the volume
Weight: The two PVC hoses with the same caliber, wall thickness, and length are comparatively heavy. The high-weight calcium powder and impurities are added too much, and the material is not pure enough to meet the requirements.