Method 1. Dissolve, take a certain amount of rubber powder and dissolve it in 5 times the mass of water, stir it and let it stand for 5 minutes and observe.In principle, the less the insoluble matter deposited on the bottom layer, the better the quality of the rubber powder.
Method 2. To form a film, take a certain quality of rubber powder, dissolve it in 2 times the amount of water, stir well and let stand for 2 minutes, stir again, and pour the solution on a flat clean glass, and place the glass in a ventilated shade.After fully drying, peel off.Observe the removed polymer film.Good quality with high transparency.Then pull moderately, good elasticity and good quality.Then cut the film into strips, soak in water, and observe after 1 day, the quality of the less dissolved in water is good.
Method 3. Rubber powder, take a certain amount of rubber powder, weigh it, place it in a metal container, heat it up to about 500 degrees, after burning at 500 degrees, cool it to room temperature, and weigh again.Good quality with light weight.