The methods to distinguish the purity of rubber powder are as follows: 1. After water dissolution, it is pure without turbidity and impurities without wire drawing; 2. Neutral and tasteless; 3. Good film forming property; 4. It does not react with any raw materials. 5. The use of any rubber powder must have a national testing speech and check the authenticity Some units use some plant starch synthetic glue, which has a certain viscosity at the initial stage but is easy to pulverize and decompose It will certainly leave engineering quality risks 6. Be careful when looking for rubber powder on the Internet Many black manufacturers even forged their business licenses