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Langfang Tianke Biotechnology Co., Ltd.
Langfang Tianke Biotechnology
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Sodium tungstate

Sodium tungstate

Molecular formula: Na2WO4·2H2O
Molecular weight: 329.87
Properties: Colorless crystal or white crystalline powder. Weathering in the dry air. It loses water of crystallization if heated to 100℃. Relative density is 3.245. Melting point is 692℃ (anhydride). Soluble in water and insoluble in alcohol.
Uses: As analytical reagent, alkaloid precipitant, water-proofing and fire-proofing agent for fabrics. It can be used in preparing metal tungsen and other tungsen compounds.
Standard: The maximum content of impurities is in percentage content

Standard/item

Analytical pure-AR

Chemical pure-CP

Assay[Na2WO4·2H2O] /百分比 

≥99.5

≥99.0

Water insoluble matter/百分比

≤0.01

≤0.02

Alkalinity

Qualified

Qualified

Chloride(Cl) /百分比

≤0.005

≤0.007

Sulfate(SO4) /百分比

≤0.01

≤0.02

Nitrogen compound (N) /百分比

≤0.001

≤0.004

Arsenic (As)/百分比

≤0.0005

≤0.0005

Iron (Fe)/百分比

≤0.0005

≤0.001

Heavy metal(Pb) /百分比

≤0.0005

≤0.002

Molybdenum (Mo)

≤0.001

≤0.005

Packing: Woven bag, kraft bag or fiber drum lined with plastic, net weight is 25kg.

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