nitrate (NO3-): ≤50 mg/kg

chloride (Cl-): ≤50 mg/kg

(NH4)2SO4

≤0.2% loss on drying, 105 °C

≤0.2% (as SO4)

≥99% (alkalimetric)

purum

≤0.002% heavy metals (as Pb)

Fe: ≤30 mg/kg

BS4500000

1

Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter

1.77 g/mL at 25 °C(lit.)

>280 °C (dec.)(lit.)