Another key impact of top quality manufacturing on the long life of uPVC doors is the ability to withstand warping. Warping is a common dilemma for uPVC doors who have not been produced with higher-high quality resources. Low quality uPVC doors are vunerable to warping as time passes as a result of different versions in heat or dampness, which can cause them to shed their condition and grow tough to close up or locking mechanism securely.