Check the profile: the quality of the profile directly determines the quality of the doors and windows. The doors and windows produced with inferior profiles have low strength and are easily discolored and deformed.

Requirements for profiles:

1.Appearance: natural color, smooth and even surface of upvc window styles pictures.

2.Multi-cavity structure: There are independent drainage cavity and steel reinforced cavity to prevent corrosion of steel lining and better heat insulation and noise reduction.

3.Have certain strength and elasticity.

4.To prevent lead poisoning, green profiles without lead should be used.