IFAN Longevity PEX-EVOH Pipes

Chlorine resistance

PEX-EVOH pipes have good chlorine resistance. They can handle chlorine levels up to 2-4 ppm. This is typical for municipal water supplies. PEX-EVOH pipes are suitable for most public water systems.

How chlorine affects PEX

Chlorine attacks the polymer structure of PEX. It can cause degradation and cracking over time. Higher chlorine levels accelerate this process. PEX-EVOH pipes are tested for chlorine resistance.

EVOH layer is sensitive

The EVOH layer can degrade from chlorine exposure. The barrier properties may be affected. The outer PEX layers provide some protection. PEX-EVOH pipes have limitations with high chlorine.

Chloramine resistance

Chloramine is used as a disinfectant in many cities. PEX-EVOH pipes resist chloramine well. They are more resistant to chloramine than chlorine. PEX-EVOH pipes are suitable for chloramine-treated water.

Ozone and chlorine dioxide

Ozone and chlorine dioxide are strong oxidizers. They can damage the EVOH layer. These chemicals are used in some treatment plants. PEX-EVOH pipes may not be suitable for these systems.

pH extremes

Extremely acidic or alkaline water can attack the pipe. The recommended pH range is 6.5 to 8.5. Outside this range, resistance decreases. Cross-linked Polyethylene – Ethylene Vinyl Alcohol Copolymer pipes should be used with neutral water.

Example: city water supply

A city uses chlorine at 1.5 ppm for disinfection. PEX-EVOH pipes are installed in a new home. The pipes resist chlorine attack. Example: a reliable, chlorine-resistant piping system.

Example: swimming pool application

A pool uses chlorine at 3-5 ppm for disinfection. Cross-linked Polyethylene – Ethylene Vinyl Alcohol Copolymer pipes may not be suitable. Higher chlorine levels cause faster degradation. Example: choose CPVC or other materials for pools.

Example: wastewater treatment

A plant uses ozone for water treatment. Cross-linked Polyethylene – Ethylene Vinyl Alcohol Copolymer pipes are exposed to the treated water. The pipes may degrade from the ozone. Example: alternative materials are recommended.

Testing standards

PEX pipes are tested to ASTM F2023 for chlorine resistance. The test simulates long-term chlorine exposure. Cross-linked Polyethylene – Ethylene Vinyl Alcohol Copolymer pipes must meet this standard.

Manufacturer chlorine recommendations

Most manufacturers provide chlorine resistance data. Check the specific chlorine level for your water. Follow the manufacturer’s guidelines. Cross-linked Polyethylene – Ethylene Vinyl Alcohol Copolymer pipes should be used within chlorine limits.

Final resistance summary

Cross-linked Polyethylene – Ethylene Vinyl Alcohol Copolymer pipes have good resistance to chlorine up to 2-4 ppm. They also resist chloramine well. They are less resistant to ozone and chlorine dioxide. pH should be between 6.5 and 8.5. Always check the water chemistry before selecting pipes. Cross-linked Polyethylene – Ethylene Vinyl Alcohol Copolymer pipes are suitable for most municipal water supplies. Example: a safe choice for typical treated water.

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