Test Specifications

Appearance: free-flowing, white crystals

Assay: >= 99.5%

pH of a 5% solution: pH 4.5 - 5.5

Insoluble matter: </= 0.005%

Residue after ignition: </= 0.01%

Calcium: </= 0.001%

Magnesium: </= 5 ppm

Heavy metals (as Pb): </= 5 ppm

Iron: </= 2 ppm

Phosphate: </= 2 ppm

Sulfate: </= 0.002%