1. Appearance: glue to blank paper, fold it in half, grind down the glue, observe whether the glue is even and fine, whether there are mechanical impurities, whether there are bubbles, etc., high-quality colloids are generally uniform and fine, without mechanical impurities.

3. Check the particles: high-quality silicone sealant is a chemically synthesized material that has been fully and evenly stirred, with fine and uniform texture, smooth, smooth and shiny after sizing and curing. The worse the quality of silicone sealant is, the more particles and impurities will be seen. The surface of the adhesive strip after sizing and curing is not as smooth and flat as that of good quality glue.

5. Inspect the curing effect: After applying partial glue, the user should first check the surface drying time of the silicone glue in accordance with the instructions on the product packaging. If the time is too short or the timeout is too much, it indicates that the quality of the silicone glue is defective (of course The influence of environmental conditions should also be considered); Then, after curing is completed, test the hardness and elasticity of the glue by hand, and the glue that is too hard or too soft is not a good glue; then the cross section of the glue can be cut to check the curing effect inside and outside the glue. Is it consistent