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langfang tianke biotechnology
professional production base of general chemical reagent and pharmaceutical accessories
hotline: 86-15076659665
products
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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] /% 

≥99.5

≥99.0

water insoluble matter/%

≤0.01

≤0.02

alkalinity

qualified

qualified

chloride(cl) /%

≤0.005

≤0.007

sulfate(so4) /%

≤0.01

≤0.02

nitrogen compound (n) /%

≤0.001

≤0.004

arsenic (as)/%

≤0.0005

≤0.0005

iron (fe)/%

≤0.0005

≤0.001

heavy metal(pb) /%

≤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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langfang tianke biotechnology co., ltd.
add: sanghang industrial park, dacheng county,
hebei, china
tel: 86-15076659665 manager ma
fax: 86-316-5569332 
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