Characters

White granular crystals or a white crystalline powder

Assay (Anhydrous basis)

>99.0%

Chloride

<50 ppm

Sulphate 

<150ppm

Readily carbonisable substances

Meets E331

Oxalat

<300 ppm

Heavy metals

<5 ppm

Arsenic

<1 ppm

Loss on drying (2h,180°C)

<0.1%

PH(1%)

3.5-3.8

Gas release  ml/g

>85