Firstly,such upvc profiles can be kept from aging, discoloration and deformation in the outdoor environment. Poor quality profiles generally show yellowing in the white due to their formula containing too much calcium, weak sun protection ability, and easy to age and crack.

When buying upvc doors and windows, consumers can put the cross-sections of different profiles together for comparison, and make preliminary identification through color and feel.

Secondly, consumers can distinguish the quality of upvc doors and windows from hardware accessories.

The hardware fittings of high-quality plastic-steel doors and windows are all made of metal with high strength, while some inferior plastic-steel doors and windows are made of plastic hardware, which will adversely affect the quality and service life of the doors and windows.