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Plastics piping systems for non-pressure underground conveyance and storage of non-potable water. Test method for determination of long-term compression strength of boxes Ingestion-build-54371 This International Standard applies to1 Scope This document specifies a test method for determining the long term compression strength for a specified period on boxes made of thermoplastics materials for non pressure underground conveyance and storage of non potable water. The document is applicable for boxes which maintain their linear behaviour over the specified period.