What is the cold brittleness of PP-R pipe?

In colder temperatures, especially in winter, the rigidity of PP-R pipes increases while the flexibility decreases, which is reflected in the overall brittleness of the pipes. This is the cold brittleness of PP-R water pipe. Cold brittleness is an inherent property of PP-R pipe itself, which is not necessarily related to its good or bad quality. PP-R pipe has certain cold brittleness in the environment below 5°C. Be careful in winter construction, and cut the pipe slowly with sharp knives. For the installed pipeline, not heavy pressure, knocking, if necessary, the vulnerable parts of the external force covered with protective material: before the pipeline for hot fusion connection, carefully check whether the pipe has been damaged.