SILICON DIOXIDE in Pakistan

Specifications
Identity	passes test
Assay (calculated on calcined substance)	99.0 – 100.5 %
Substances soluble in water	≤ 5 %
pH-value (4 %, water)	3.5 – 5.5
Chloride (Cl)	≤ 110 ppm
Al (Aluminium)	≤ 10 ppm
As (Arsenic)	≤ 3 ppm
Ca (Calcium)	conforms
Fe (Iron)	≤ 500 ppm
Hg (Mercury)	≤ 1 ppm
Pb (Lead)*	≤ 5 ppm
Residual solvents (ICH Q3C)	excluded by production process
Loss on ignition (out of dried substance)	≤ 2.0 %
Loss on drying	≤ 2.5 %
Spec. surface	200 ± 25
Elemental impurity specifications have been set considering ICH Q3D (Guideline for Elemental impurities). Class 1-3 elements are not likely to be present above the ICH Q3D option 1 limit, unless specified and indicated (*). Conforms to the purity criteria on food additives according to the current European Commission Regulation.
Corresponds to Ph Eur,NF,JP,E 551
Elemental impurity specifications have been set considering ICH Q3D (Guideline for Elemental impurities). Class 1-3 elements are not likely to be present above the ICH Q3D option 1 limit, unless specified and indicated (*). Conforms to the purity criteria on food additives according to the current European Commission Regulation.
Corresponds to Ph Eur,NF,JP,E 551