Definition of uPVC noun from the Oxford Advanced Learner's Dictionary

 

uPVC

 noun
noun
BrE BrE//ˌjuː ˌpiː ˌviː ˈsiː//
 
; NAmE NAmE//ˌjuː ˌpiː ˌviː ˈsiː//
 
[uncountable]
 
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the abbreviation for unplasticized polyvinyl chloride (a strong plastic used to make window frames and pipes)
See the Oxford Advanced American Dictionary entry: uPVC