Specification
Grade U.S.P F.C.C Technical E262
Assay% 99.0-101.0 99.0-101.0 98.0-101.0 99.0-101.0
pH at 20 in 5% aqueous sol. 7.5-9.0 7.5-9.0 7.5-9.0 8.0-9.5
Insoluble Matter%≤ 0.05 0.05 0.05
Heavy metals(as Pb) ppm≤ 0.001 10 10mg/kg
Chloride(CI) %≤ 0.035 0.1
Phosphate(PO4) %≤ 0.001
Sulfate(SO4) %≤ 0.005 0.05
Iron(Fe)%≤ 0.01
Water(loss on drying,120,240min) %≤ 1.0 1.0 2.0 2.0(w/w)
Free alkalinity(as NaOH)%≤ 0.2
Potassium compounds To pass test
Lead(Pb)≤ 5mg/kg
Mercury(Hg)≤ 1mg/kg
Arsenic(As) ppm≤ 3 3mg/kg
Reducing substances(as formic acid)≤ 1000mg/kg
Calcium(Ca)%≤ To pass test
Magnesium(Mg)%≤ To pass test
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