1. First, when purchasing, check whether inward folding is present. This should be checked first because some manufacturers, in order to raise production efficiency, may increase the reduction during processing, which can produce folds and leave crease lines on the finished surface, greatly reducing the strength of the PU insulated pipe itself.

　　2. Another point is that pipes with an uneven surface should not be purchased; such pipes were produced with roll grooves that were already severely worn.

　　3. In addition, the surface of this type of pipe should be very smooth, so if problems such as surface scabs are found, it often indicates that there are relatively many impurities, because these impurities cannot dissolve like the raw materials and therefore still exist in solid form after processing.

　　4. Observe whether various information printed on the pipe surface is clear. Good-quality pipes themselves have relatively high requirements for clarity when printing. Some pipes that contain more impurities may even have distorted printed characters during use.

　　How to pick out good-quality PU insulated pipes is something everyone now knows. Products selected from these aspects, because several key parts meet usage requirements, mean that there is little need to worry about product quality problems in actual use.