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Sodium fluoride

[Name] Sodium fluoride[7681- 49-4] 
[Molecular formula] NaF
[Molecular weight] 41.98
[UN] 1690
[IMDG Code]83015
[Product Specifications]

Item Index Name Item Index Name
Appearance White crystal powder Water-insoluble matter, max0.3%
Purity min99% Silicon oxide(SiO2) max0.4%
Free Alkalis(as Na2CO3) max0.1% Water(H2O) max0.5%
Free acid(HF) max0.1% Sulphate(SO4) max0.3%
Heavy metals (as Pb) max0.005%    

[Character] It is a white crystal with relative density of 2.558, mp 993°C, bp 1695°C,. It is slightly soluble in water, insoluble in ethanol. Its aqueous solution is weak basic. It is soluble in hydrofluoric acid and produces sodium hydrogen fluoride. It has toxic. 
[Uses] It is used as insecticide in agriculture, timber preservative, slagging medium of metallurgy, analyzing reagent. It is also used in welding flux of machine planer tool, sterilization of fermentation equipment, and used to manufacture fluorine compounds. 
[Packing] Packing with plastic weaven bag lined with polythene plastic bag , 25kg per bag.