1. Check the sealing strip. When selecting the door and window sealing strip, pay attention to whether there are obvious cracks on the sealing strip, whether the unevenness of unevenness, etc. The surface of the sealing strip is required to be clean, free of scratches, bumps, rust, smooth, uniform thickness, and no pores.

2. Intuitive observation of the sealing strip is to see whether the cross-section joint of the sealing strip is close to the color of the surface of the sealing strip. If it is close, it means that the sealing strip material contains not many fillers, so you can buy it.

3. The quality of the sealing strip material. Wrap the sealing strip on the profile as tightly as possible, and place it under high temperature for a period of time (placed on the roof or in a sunny place), and observe whether the surface of the profile and the contact surface of the sealing strip is stained or discolored, and the surface of the sealing strip is dusty Whether it’s yellowing (it’s easy to absorb soil if there is oil on the surface of the sealing strip) oil seepage, whether the hands are dirty, the surface of the good-quality sealing strip is smooth, dust-proof, oil-resistant, high-temperature resistance, etc., yellowing will not occur under high-temperature irradiation Oily, dirty hands, etc.