China (Mainland) 
1)industrial grade
2) food additive grade
usage
1)used in food additives & food as a leavening agent;
2)benchmark used for analysis reagent, reagent and molten silicate sulfate and insoluble flux;
3)is mainly used in electronic industry kinescope glass shell of manufacture, the decarburization, potash fertilizer production;
4)used in glass, printing and dyeing, soap, enamel, preparation of potassium, pharmaceutical, etc., used for gas adsorbent, dry powder, rubber stabilizer, etc;
5)used for all kinds of the preparation of potassium