How to distinguish the quality of joints, what materials are commonly used in the market?

Answer: The joints can be distinguished from the shape, weight and thickness. In order to reduce the cost, many small manufacturers produce the joints with too light weight, insufficient thickness and insufficient pressure capacity, resulting in cracking after tightening or short service life. Customers are expected to choose the qualified joints produced by the trusted manufacturers.

Commonly used joint materials on the market are PP and PA materials. The materials are different in price.