lettersU-pvc-U pipe,it isthe originalunplasticized,meaningisnot addedplasticizer.PVC-Uis equivalentof UPVC.Collectively referred to asrigid PVCpipe.
PVC-Ppipeof symbolofthesoft PVC.
PVC-Mmodifiedto improvetoughness,thedevelopment of variousimpactresistance tocrackinggoodwhile maintaininghighstrengthmodified PVCpiping systems, commonly known asPVC-Mor PVC-A orPVC-HI.
PVC-Opipeprocessingbiaxially oriented, so thatthemolecular orientation,substantial increase instrengthwhile improvingtoughness.Commonly known asPVC-OorBO-PVC.