1. Observe whether the tube cavity is regular and the wall thickness is uniform. The inner cavity and outer edge of the high-quality steel wire tube are evenly distributed in the standard circular tube wall. The wall thickness difference of the poor quality tube can reach 2mm. Therefore, when working under high pressure, it is easy to burst or deform due to uneven force on the tube wall.
2. Observe whether there are bubbles or other visible objects on the wall of the large steel wire tube. It is colorless and transparent. The wall of the high-quality steel wire tube is crystal clear and free of any impurities. However, defective hoses may turn yellow due to improper handling, decomposition, aging or long-term improper storage.
3. High-quality hoses, except for a little plastic smell, do not have any other petrochemical smell. Low-grade steel pipes have an unpleasant diesel smell, especially in hot summer.
4. The inner and outer walls of high-quality large steel wire tubes are smooth and feel good. While the inferior pipes are rough.
5. When measuring the wall thickness, cut off both ends of the large steel wire tube. And select the middle pipe as a sample for testing. To prevent some illegal manufacturers from doing things at both ends of the pipe. The actual wall thickness is thinner than the two ends of the pipe.
6. Cut a few centimeters of steel wire at both ends of the PVC steel pipe and fold the steel wire repeatedly. This can test the strength and toughness of the steel wire. Poor quality steel wire will break after folding it once or twice. The steel wire of high-quality PVC steel pipe can only be cut with special tools. The quality of the steel wire determines the quality of the entire pipe. PVC steel pipes with quality problems caused by steel wire are prone to irreversible deformation.