The professional and reliable method is that the hot and cold water pipes of PPR are under pressure, so they cannot be repaired. There is only one way: stop the fluid from generating a closed space (such as closing the brake), cut off the broken pipe section-add special joints (as needed)-hot melt welding. This is a professional method. The tool to be used is a PPR pipe hand-held hot melt welder, which requires a pipe joint or a short piece of pipe, as the case may be.
If you use glue, it will be extremely unprofessional, because the principle of hot melt welding is that molecules of homogeneous materials in different States recombine, and there are no other impurities in the middle. Of course, there is no possibility of harmful substances, but it also depends on whether the PPR tube you use meets the standards. PPR itself is a completely green product, but this product can also be mixed with things like milk powder, so we should pay attention to the management of home decoration.