PP is a semi-rigid, transparent, easily formable and cost-effective polymer produced by the polymerization of propylene using a ZIEGLER-NATTA catalyst. Different grades such as atactic, isotactic and syndiotactic polypropylene can be produced. The glass transition temperature of isotactic PP is approximately -10°C and its melting temperature is around 160°C. PP has good chemical resistance but can be affected by chlorine, nitric acid and other strong oxidizing agents. Although it is resistant to visible light, UV radiation may degrade the surface of polypropylene materials. It is combustible but burns slowly and is non-toxic. When properly modified, PP exhibits good heat resistance. There are three types of polypropylene: 1. PPH / Polypropylene Homopolymer, 2. PPC / Polypropylene Block Copolymer, 3. PPRC / Polypropylene Random Copolymer. The most distinctive feature of PPRC is its suitability for plumbing systems, hot water installations and its ability to be welded using hot plate welding technology.