PPR pipes are made of polypropylene random copolymer plastic and it is commonly a cylindrical pipe and straight. They are lightweight which makes them easy to transport and are usually offered in green and white. The PPR pipes are also known for having walls that are thicker than PVC pipes. The PPR piping system comes with fittings, valve, fusing machine, and other accessories that are available for every size of the pipe. They are safe to use and are non-toxic, that’s why this is the best choice when it comes to drinking water piping systems.
http://www.polygonpipe.com.cn/ppr-piping-system/