what is the category of windows?
a. Aluminum alloy system window
Aluminum alloy system doors and windows (the term "system doors and windows" is provided by the industry encyclopedia) are high-performance windows with better water tightness, air tightness, wind pressure resistance, and other performance. The process is more mature and standardized
b. Aluminum alloy non system window
Aluminum alloy non system windows are generally composite windows, which are relatively difficult to ensure performance. The appearance varies greatly depending on the material, and they are commonly used in the domestic market
c. Plastic steel window
The structure of plastic steel windows is PVC surface layer+steel lining, and its process is also uneven, with good insulation performance and poor appearance effect, which is generally considered to be relatively low-end