What is the difference between PP pipe and PPH pipe

What is the difference between PP pipe and PPH pipe

The special materials for PP pipes are divided into three generations: the first generation is modified by homopolypropylene, which is called PP-H, the second generation is polymerized by PP and PE block copolymerization process, which is called PP-B, and the third generation is random. It is modified from copolymerized polypropylene, called PP-R. The main differences are:

The processing performance and environmental stress cracking resistance of these three materials were improved in turn.

PP-B has poor strength and better impact resistance, PP-H has better strength and poor impact resistance (more brittle), and PP-R avoids this defect.

The strength of PP-B and PP-H pipes decreases significantly after one year of manufacture, while PP-R pipes maintain high strength even after 50 years.

Some special varieties of imported PP-B, whose performance is close to PP-R, are also excellent pipe materials.