... .003% maxWater insoluble0.05%max0.06% maxApplication: 1. Industrial grade: used in such industries as oil field, paper-making, textile, ... tanning industry, metallurgical industry and building material industry, and used as a water softening agent in solution for printing, ... and soil analytical chemical reagent;2. Food grade: mainly used as additive agent, PH adjusting agent, fermenting agent, and ...