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https://std-ol.cys.org.cy/plastics-unplasticized-polyvinyl-chloride-pvc-u-profiles-for-building-applications-part-1-designation-of-pvc-u-profiles
Plastics - Unplasticized poly(vinyl chloride) (PVC-U) profiles for building applications - Part 1:...
This European Standard establishes a system of designation for profiles made of unplasticized poly(vinyl chloride) (PVC-U) intended to be used for building...
poly vinyl chloride