Item

Standard

Appearance

White powder

Assay

≥ 50.0%

Loss on Drying

≤ 5.0%

Sieve Analysis

≥ 90.0% through No. 20 (US)

Heavy Metal

≤ 10mg/kg

Arsenic

≤ 2mg/kg

Pb

≤ 2mg/kg

Cadmium

≤ 2mg/kg

Mercury

≤ 2mg/kg