POTASSIUM BICARBONATE, USP (KHCO3) SPECIFICATIONS TOTAL ALKALINITY    99.0 – 101.0% SULFATE (as SO4)    20 ppm max CHLORIDE (as Cl)    10 ppm max SODIUM (Na)    250 ppm max IRON (Fe)          10 max HEAVY METALS (as Pb)       3 ppm max H2O INSOLUBLE PORTION    50 ppm max * Note:  This product is hygroscopic by nature; hence, agglomeration may occur.