Silicon Dioxide

■ Chemical Description

-- Silicon Dioxide

■ CAS No. 14808-60-7

■ Molecular and Structural Formula SiO₂

■ Characteristics

--Light white powder; odorless and tasteless;

--Insoluble (HF except) acid and soluble in hot alkaline solution;

■ Specification

No	Tests	Specification
		HG2791-1996	USP28/NF23
1	pH	--	4-8
2	Silica content (after burning)%	≥96.0	≥99.0
3	Loss on drying%	≤5.0	≤5.0
4	Loss on ignition%	≤8.5	≤8.5
5	Heavy metals (as Pb)%	≤0.003	--
6	Lead%	≤0.001	--
7	Arsenic%	≤0.0003	--
8	Soluble salt dissociation (as Na2SO4) content%	≤4	--
9	Chloride%	--	≤0.1
10	Sulfate%	--	≤0.5

■ Application

--Used as disintegrating agents in tablets and oil adsorption in drugs

■ Packaging and Storage

--Packed in 25, 50 kg fiber or plastic drum, inner lined with PE bags;

--Stored in dry place at room temperature;

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