Mix the redispersible polymer powder and water in a ratio of 1:5, stir evenly, let it sit for 5 minutes, and observe the sedimentation at the bottom. In general, the fewer deposits, the better the quality of the redispersible polymer powder.
Mix redispersible polymer powder and water in a 1:2 ratio, stir thoroughly, allow it to stand for 2 minutes, and then stir again. Pour the solution onto a clean, flat glass surface, place the glass in a cool and ventilated area, and allow it to dry completely. Peel off the coating from the glass and observe the polymer film. The higher the level of transparency, the better the quality of the polymer powder. Also, stretch the film moderately; the better the elasticity, the higher the quality. Cut the film into strips and soak them in water. After one day, observe the degree of dissolution; less dissolution indicates better quality.
Weigh an appropriate amount of polymer powder, place it into a metal container, heat it to approximately 500 degrees Celsius, incinerate it at a high temperature of 500 degrees Celsius, allow it to cool, and then reweigh it. The lighter the weight, the better the quality.
Use cardboard or thin boards to test the glue. Take two small pieces of cardboard or thin wood boards of equal size and apply adhesive to the interface of the sample to ensure even application. Put the two boards together, flatten them, and apply pressure with a weight of 500g to 1000g for 30 minutes. Then, check the bonds. If it is firmly fixed and the interface is 100% destroyed, it indicates that the adhesive product is of higher quality. If only the interface is partially damaged, it indicates that the bonding strength is insufficient, and the quality is subpar. If the interface is intact, it indicates that the product is of low quality or counterfeit.
