PP-R hot melt welding temperature is: 253℃-274℃. If the temperature is lower than 253℃, the pipes and fittings will only melt on a thin surface layer. Once they are welded, the strength of the weld cannot be guaranteed. This is what we usually call the false welding phenomenon.
On the contrary, if the temperature is higher than 274℃, the surface molecules of the pipe and fittings will be destroyed by high temperature, making PP-R form a thin liquid, which will make the inner diameter of the pipe smaller after connection, and more importantly, brittle cracks will occur in the connection part. , Especially when the piping system is fully completed and pressurized with water, this kind of problem often occurs.