The DONG YANG PP-C Pipe is not necessary to provisional cross linked treatment just like the Polyethyiene pipe as it is high in heat conversion temperature, and as they are not corrosive due to the external materials and chemical action as is cement or moisture, etc. convenient to bending process and free from poisonous, the durability is semi-permanent with the strong property of materials of heating, hot water supply, water supply or industrial pipe because of harmless as they are products of impact proof, chemical resistance as well as light and so it will serve more economical as they could save epoch making reduction of working expenses as well as reducing terms of construction work.