Topic summary
UPVC
Extracted from the Wikipedia article Polyvinyl chloride.
Plasticizers
Among the common plastics, PVC is unique in its acceptance of large amounts of plasticizer, yielding physical properties that range continuously from a rigid solid to a soft gel, and almost 90% of all plasticizer production is used in making flexible PVC. The majority is used in films and cable sheathing. Flexible PVC can consist of over 85% plasticizer by mass, but unplasticized PVC (UPVC) should not contain any.