... . We own 6.2 sq km exploitable underground salt area, storage of 200,000,000 tonsAnnual output of ... 1Mt.3. Index of industrial productionPurified Industrial (usage) Salt Index ItemSuper GradeA GradeNaCl(%)99.1%min98.5%minMoisture (%) ... insoluble (%)0.05%max0.1%maxCa2+, Mg+ (%)0.025%max0.04%max(SO4)-(%)0.3%max0.5%max4. ... in a cool, ventilated, dry place. PDV salt,industrial salt, sodium chloride,99.1min