Chlorine can degrade the EVOH barrier over time
PEX EVOH pipes are resistant to normal chlorine levels. However, high chlorine concentrations can degrade the EVOH layer. The barrier properties may be reduced. Example: municipal water with high chlorine levels.
How chlorine affects EVOH
Chlorine is a strong oxidizing agent. It can attack the EVOH polymer chains. This causes the material to degrade. PEX EVOH pipes EVOH layer is vulnerable to chlorine.
Chlorine concentration limits
Typical municipal chlorine levels are 0.5-2 ppm. PEX EVOH pipes resist up to 2-4 ppm. Higher levels accelerate degradation. PEX EVOH pipes have chlorine limits.
Impact on oxygen barrier
Chlorine degradation reduces the EVOH barrier effectiveness. Oxygen permeability may increase. The corrosion protection is reduced. PEX EVOH pipes may lose oxygen barrier.
Testing and standards
ASTM F2023 tests chlorine resistance. The pipe is exposed to high chlorine levels. The results determine the pipe's rating. PEX EVOH pipes meet ASTM standards.
Effect of temperature
Higher temperatures increase chlorine's impact. The degradation rate accelerates with heat. This reduces the pipe's lifespan. PEX EVOH pipes are more vulnerable at high temperatures.
Example: municipal water supply
A city uses chlorine at 1.5 ppm for disinfection. PEX EVOH pipes resist this level for decades. The barrier remains effective. Example: a safe, reliable system.
Example: high-chlorine well water
A well has chlorine at 5 ppm for disinfection. PEX EVOH pipes may degrade faster. The EVOH layer loses effectiveness. Example: consider alternative materials.
Example: swimming pool application
A pool uses chlorine at 3-5 ppm. PEX EVOH pipes are not suitable for pool water. The high chlorine damages the EVOH. Example: use CPVC or other materials.
Manufacturer recommendations
Manufacturers provide chlorine resistance data. Follow the recommended chlorine limits. Consult the product data sheet. PEX EVOH pipes should be used within limits.
Prevention and monitoring
Monitor chlorine levels in the water. Install a carbon filter to reduce chlorine. This protects the EVOH layer. PEX EVOH pipes benefit from chlorine control.
Final chlorine impact summary
High chlorine levels degrade the EVOH barrier in PEX EVOH pipes. Normal municipal levels (0.5-2 ppm) are safe. Levels above 2-4 ppm accelerate degradation. Temperature increases the effect. ASTM F2023 tests chlorine resistance. The oxygen barrier may be reduced. Use the pipe within chlorine limits. PEX EVOH pipes are suitable for typical municipal water. Example: check chlorine levels before installation.