Formula   Ｎａ２ＳｉＦ６

Molecular Weight 188.06

Execute standard HG/T3252-2000 

U.N-NO        2674

H.S-NO      2826.2000

Properties     It is colorless hexagonal, odorless and tasteless crystal with relative density 2.679. It is hygroscopic. It is soluble in ether, insoluble in alcohol. The solubility in acid is greater than in water. It decomposes in alkaline solution and produces sodium fluoride and silicon dioxide. It is decomposed to sodium fluoride and silicon tetrafluoride by heating to 300℃. It is noxious!

Usages        It is used as antiseptic in timber industry, hygroscopic agent of acid-resisting concrete, s olidifying agent in natural latex products, additive in plating with zinc, nickel, iron and filler in plastic and fluorinating agent in pharmaceuticals and drinking water. It is used to produce insecticide in pesticide industry and sodium fluoride in man-made cryolite.

Packing        In 25kg and 50 kg plastic woven bag lined with high pressure polyethylene plastic bag.

Item

Excellent grade

Grade I

Grade II

Sodium fluorosilicate(based on dry)

％ ≥ 99.0

％ ≥ 98.5

％ ≥ 97.0

Iron(Fe)

％ ≤0.02

--

--

Free acid(based on HCI)

％ ≤ 0.1

％ ≤ 0.15

％ ≤ 0.20

Heave metal(based on Pb)

％ ≤0.02

％ ≤0.05

％ ≤0.05

Water-insoluble matter

％ ≤ 0.40

％ ≤ 0.50

％ ≤ 1.00

Loss on Drying at 105℃

％ ≤0.3

％ ≤0.4

％ ≤0.6

Fineness(through 250μm test bolter)

％ ≥90

％ ≥90

％ ≥90

Sulphate (as SO4ˉ)

％ ≤ 0.4

％ ≤ 0.5

％ ≤ 0.5