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Uponor PVC Storm water pipes, range OD 110-400 are a smooth pipe system for gravity storm water applications. The pipes are made of unplasticized polyvinyl chloride (PVC-U) and have a ring stiffness rating of SN8. PVC is corrosion resistant and effectively withstands most solvents, acids, bases and lubricants. The smooth, massive wall design is developed for impact-resistant and durable pipes. The pipes are approved in accordance with Insta-Cert and Nordic Polymark, acc. EN 1401-1 and NPM Cert. nr. 4007.