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what is definitin of grade in ppr pipes
Polypropylene random copolymer is what PPR material is. The acronym refers to material that is high in molecular weight, low in melt flow rates, and strong in flexibility. It particularly will be found used in fittings and pipes even though sheeting is another possible use.
Chlorinated Polyvinyl Chloride (CPVC) pipes can withstand heat up to 180 degrees. A special glue is used to blond it together. PPR pipes are a made of plastic and uses no glue as it is heat-fused. PPR is a commercial product.
In the U.S. they are called plumbers, assuming you mean water pipes, and not the pipes that one smokes.
28mm