Chemical Resistance

Is PE pipe resistant to chemicals commonly found in soils?

PE100 pipes have excellent resistance to naturally occurring chemicals found in the soil. The polymer and pipe manufacturers have extensive test data regarding the chemical resistance of the base polymer and PE100 pipe. Advice can be sought if there is any doubt as to the suitability of PE100 for a particular application or environment.

ISO Technical Report 10358 includes an authoritative table identifying the resistance of PE, and other plastic materials, to a large range of chemicals.

Is PE pipe resistant to chemicals commonly used for disinfection and water treatment?

PE pipe is generally resistant to the chemicals commonly used for water treatment and disinfection.

Disinfection of water mains is a frequent operation. Disinfection takes place when commissioning newly constructed potable water mains; mains that have
been removed from service for planned repairs or for maintenance that exposes them to contamination; mains that have undergone emergency repairs due to physical failure; and mains that, under normal operation, continue to show the presence of coliform organisms. The chlorine disinfection process puts pipe in contact with a strong oxidising agent.

Several studies have been conducted to verify the effects of chlorine disinfection on the performance of PE pipes. A study by the US Plastic Pipe Institute included pre- and post-exposure testing of several characteristics of PE pipes, including resistance to slow crack growth. The testing performed in this study indicated that chlorine disinfection, when conducted within the guidelines of AWWA-C651, did not have a significant adverse affect on the subsequent performance of PE pipe. No indications of any downward trends in the exposure tests were evident.

This is supported by many years of extensive trouble free use in potable water applications. However due to the variety of chemicals, concentrations and practices in various countries if there is any doubt, advice can be sought from the polymer or pipe manufacturer.

References

ISO/TR10358:1993 Plastics pipes and fittings - Combined chemical resistance classification table.
TR-34/2001 Disinfection of Newly Constructed Polyethylene Water Mains . The Plastics Pipe Institute, Washington DC, USA. 2001

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