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Verification of diffusion resistance was carried out by the Dutch KIWA Institute. KIWA is an internationally recognised institute for the certification of drinking water systems, based in the Netherlands. The KIWA testers have determined that even after 100 years’ service, no diffusion of the specified substances is likely to occur.
The long-term permeation and diffusion measurements were carried out using bottle tests and helium diffusion. The pipe was immersed in a solution of methanol, trichloroethene and toluene.
As a result of the positive test results, the SLA® Barrier pipe was awarded product certificate BRL-K-545/01 by KIWA in 1995. The egeplast SLA® Barrier pipe system is therefore the only plastic pipe in the world approved for installation in contaminated soil..