The differences between HDPE pipes and PE pipes are:
1. HDPE pipe is a type of PE pipe: PE is polyethylene plastic, HDPE is high-density polyethylene, and PE pipes include medium-density polyethylene pipes and high-density polyethylene pipes. It can be seen that hdpe pipes belong under PE pipes.
2. Different uses: General PE pipes (medium density polyethylene pipes) are suitable for transporting gaseous artificial gas, natural gas, and liquefied petroleum gas, while hdpe pipes (high-density polyethylene pipes) are mainly used for transporting natural gas.
3. Different densities: The general classification in the United States is based on ASTM D1248. The density of HDPE is above 0.940g/; the density of medium density polyethylene (MDPE) ranges from 0.926 to 0.940g/.