The appearance of the profiles should be observed. The color should be bluish white rather than white as commonly believed. Pay attention to whether the color of the profiles that make up the frames and leaves of doors and windows is consistent, whether the appearance is uniform, and whether the cavity distribution is reasonable. Calcium carbonate is usually added to …

1. After the doors and windows are installed, the protective film on the profile surface shall be removed in time and wiped clean; Otherwise, a large amount of adhesive of the protective film will remain on the profile, which is clay, sticky and very ugly, and it is difficult to clean up again. 2. When it is windy, the casement …