What is the relationship for PP-R pipe and PP-C pipe?

The previous period, the domestic market appear PP-C pipe, pipe fittings, the installation method and PP-R line. Many people confused PP-R and PP-C What is the difference, resulting in a lot of misunderstanding and confusion. International standards, hot and cold water points polypropylene PP-H, PP-B, PP-R three, no PP-C. Market PP-C pipe is actually PP-B pipe, the raw material is polypropylene block copolymer type Pipe Compound. PP-B pipe is a kind of hot and cold water pipes, the price is cheaper, its heat resistance, pressure resistance and a great gap between PP-R. For example: use grade 2, the design pressure 0.6MPadn25mm pipe, PP-R pipe wall thickness of 3.5mm, PP-B (PP-C) pipe wall thickness to 5.1mm; design pressure 0.8MPadn25mm, PP-R pipe wall thickness of 4.2 mm, while the PP-B (PP-C) can not be used. Because the required wall thickness was too thick. Size of the market structure in line with the PP-R pipe PP-C, its use is much lower, not be confused with PP-R pipes, but can not be used in determining the conditions to PP-C PP-R pipe pipe replacement. 2 use that design temperature 70 ℃, heating water using.