What are the differences in pressure resistance and corrosion resistance of Plastic Pipes made of different materials?

Plastic pipes of different materials have significant differences in pressure resistance and corrosion resistance, which directly affect their application scenarios and service life. The following is a detailed analysis:

Common plastic pipe materials and their characteristics
PVC (polyvinyl chloride)
Pressure resistance: PVC pipes are usually used in low-pressure or medium-pressure systems, and their pressure resistance depends on the wall thickness and grade (such as PVC-U or PVC-M). The pressure range of standard PVC pipes is generally 6-16 bar (Bar), which is suitable for drinking water transportation and drainage systems.
Corrosion resistance: PVC has good corrosion resistance to most acids, alkalis and salts, but is more sensitive to certain organic solvents (such as ketones or aromatics), and long-term contact may cause the material to soften or dissolve.
PE (polyethylene)
Pressure resistance: PE pipes (especially HDPE, high-density polyethylene) have high pressure resistance and are suitable for high-pressure transportation systems. The pressure range of HDPE pipes can reach 16-25 bar, or even higher, and is widely used in natural gas, oil and hydraulic transportation.
Corrosion resistance: PE exhibits excellent corrosion resistance to almost all chemicals, including strong acids, strong bases and salts. It is widely used in marine engineering and chemical industries.
PPR (random copolymer polypropylene)

Pressure resistance: PPR pipes are mainly used in hot and cold water delivery systems, and their pressure resistance is moderate, usually between 10-20 bar. The pressure resistance of PPR pipes at high temperatures is better than PVC, but lower than HDPE.
Corrosion resistance: PPR has good corrosion resistance to most inorganic acids, bases and salts, but may be affected by some strong oxidizing substances (such as concentrated nitric acid or chromic acid) under high temperature conditions.
HDPE (high-density polyethylene)
Pressure resistance: HDPE pipes are the most pressure-resistant of all plastic pipes and are suitable for high-pressure gas and liquid transportation. Its pressure range is usually above 16-30 bar, depending on the wall thickness and grade.
Corrosion resistance: HDPE has extremely high chemical stability and can resist corrosion from almost all acids, alkalis and salts, making it very suitable for chemical plants, sewage treatment plants and seawater transportation systems.
PVDF (polyvinylidene fluoride)
Pressure resistance: PVDF pipes have high pressure resistance and are suitable for medium and high pressure systems, usually in the range of 10-25 bar.
Corrosion resistance: PVDF is one of the most corrosion-resistant plastic pipes, especially suitable for conveying strong acids, strong alkalis and other corrosive media. It is widely used in the chemical industry and semiconductor manufacturing.

Key factors in material selection
Pressure requirements
If high-pressure liquids or gases need to be conveyed, it is recommended to choose HDPE or PE pipes.
For low-pressure systems, PVC or PPR pipes are usually more economical choices.
Media type
PVC and PE are common choices when conveying ordinary water or sewage.
In chemical or seawater environments, HDPE or PVDF should be given priority to ensure corrosion resistance.
Temperature Conditions
PPR pipes are suitable for hot water transportation, while PVC and PE are more suitable for normal or low temperature environments.
HDPE and PVDF can be used in a wide temperature range and are suitable for extreme conditions.
Cost and Maintenance
PVC and PPR have lower initial costs, but may require more frequent maintenance.
HDPE and PVDF have higher initial costs, but are more economical in the long run due to their durability and low maintenance requirements.

The differences in pressure resistance and corrosion resistance of Plastic Pipes of different materials are mainly reflected in the following aspects:

In actual applications, the appropriate pipe material should be selected according to the specific use conditions (such as pressure, medium type, temperature and cost) to ensure the safety and reliability of the system.