Heating pipe, hot water heating system pipe, water supply and drainage pipe, drainage pipe and other PPR pipe fittings are under the influence of saturated water all year round and do not destroy, and their compressive strength is not significantly reduced, which is called the water resistance of the pipe. Water resistance of famous brand pipe fittings has a close relationship with reliability and compressive strength. The following are the similarities of water resistance PPR pipe fittings:

1. The water resistance of PPR tube material is indicated by the soft Vica index. In the application of heating, high temperature hot water, open assembly and outdoor water supply and drainage pipe, the soft Vica index of water-resistant materials has certain advantages. Softening coefficient indicates the decrease level of compressive strength after soaking, which generally fluctuates between 0 and 1. The lower the softening coefficient is, the greater the reduction in hardness of the material after hygroscopic saturation, so the worse its water resistance is. For materials that are often located in water or critical structures with severe moisture return, the softening factor should not be lower than that. For materials with light moisture return or primary and secondary structures, the softening coefficient is not suitable for less than 0.75. Materials with a softening coefficient of more than 0.80 can generally be called moisture resistant materials.

2. The phenomenon of thermal expansion and cold contraction of the pipe is inevitable in use. The PPR pipe stiffness from water-resistant materials is improved, and it is not easy to relax when leveling the pipe, which enhances the appearance of the pipe. The bending and bending elastic force of the pipe is improved, and the shape is still stable under high temperature.

3. Moisture resistance pipe fitting connection and permeability resistance performance should be paid attention to. Because the PPR pipe production line through the interpretation of the characteristics of the pipe, the design of the successful trial production of special aluminum stripping tools, aluminum layer and PPR surface off, also can be used to carry out the connection of hot melt socket method, to avoid the common PPR useful copper pipe connection is very easy to water leakage, better is the completion of the pipeline water resistance.

Moisture resistant PPR water pipe material at the same time has higher tensile strength, high temperature resistance, UV protection and aging resistance.