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Tin Fluoride or Stannous Fluoride
CAS Number: 7783-47-3
Molecular Formula: SnF2
Molecular Weight: 156.7
Tin Fluoride or Stannous Fluoride
Stannous Fluoride USP Grade Specifications
SnF2 -- 156.71
Tin fluoride (SnF2) CAS 7783-47-3
Stannous Fluoride contains not less than 71.2 percent of stannous tin (Sn ++), and not less than 22.3 percent and not more than 25.5 percent of fluoride (F), calculated on the dried basis.
Identification:
A: To 5 mL of a solution (1 in 100) in a test tube add 2 mL of calcium chloride TS: a fine, white precipitate of calcium fluoride is formed.
B: Mix on a spot plate 2 drops of a solution (1 in 100) with 2 drops of silver nitrate TS: a brown-black precipitate is formed.
C: Add 1 drop of a solution (1 in 100) to 2 drops of mercuric chloride: a white, silky precipitate is formed. On further addition of the solution (1 in 100), a brown-black precipitate is formed.
pH: between 2.8 and 3.5, in a freshly prepared 0.4% solution.
Loss on drying: Dry it at 105C for 4 hours: it loses not more than 0.5% of its weight.
Water-insoluble substances: Transfer about 10 g, accurately weighed, to a 400-mL plastic beaker, add 200 mL of water, and stir with a plastic rod for 3 minutes, or until no more solid dissolves. Filter through a tared filtering crucible, and wash thoroughly, first with ammonium fluoride solution (1 in 100), then with water. [NOTE—Prepare and use the filtering crucible in a well-ventilated hood.] Dry the residue at 105C for 4 hours, cool, and weigh: the weight of the residue does not exceed 0.2%.
Antimony:
Rhodamine B solution: Dissolve 20 mg of rhodamine B in 200 mL of 0.5 N hydrochloric acid.
Standard preparation: Transfer 55.0 mg of antimony potassium tartrate, accurately weighed, to a 200-mL volumetric flask, dissolve in water, dilute with water to volume, and mix. Transfer 5.0 mL of this solution to a 500-mL volumetric flask, add 6 N hydrochloric acid to volume, and mix.
Test preparation: Transfer 1.0 g of Stannous Fluoride, accurately weighed, to a 50-mL volumetric flask, add 6 N hydrochloric acid to volume, and mix.
Procedure: Pipet 5 mL each of the Standard preparation and the Test preparation into separate 125-mL separators, add 15 mL of hydrochloric acid and 1 g of ceric sulfate, and allow to stand for 5 minutes, with occasional shaking. Add 500 mg of hydroxylamine hydrochloride, and shake for 1 minute. Pipet 15 mL of isopropyl ether into the mixture, shake for 30 seconds, add 7 mL of water, and mix. Cool in a water bath at room temperature for 10 minutes, shake for 30 seconds, allow the layers to separate, and discard the aqueous phase. Add 20 mL of Rhodamine B solution, shake for 30 seconds, and discard the aqueous layer. Decant the ether layer from the top of the separator, and centrifuge, if necessary, to obtain a clear solution. Concomitantly determine the absorbances of the ether solutions from the Test preparation and the Standard preparation at the wavelength of maximum absorbance at about 550 nm, with a suitable spectrophotometer, using water as the blank: the absorbance of the Test preparation does not exceed that of the Standard preparation (0.005%).
Please visit SDS Safety Data Sheet of Tin Fluoride or Stannous Fluoride Suppliers.
American Molecules, also known as ammol.org is a distributor, supplier and manufacturers' representative of all types of Pharmaceuticals, Functional Ingredients, Excipients and Specialty Chemicals in Texas USA. Our principals manufacture supply and export USP NF BP, Ph Eur, etc grades of chemicals pure and reagent grade, mineral fortifiers, FCC food grade. Tailor made particle size and customized specifications are offered. The principal's facility is having one or more of the certifications like FDA approval and GLP, cGMP, ISO9001, ISO14001, ISO/IEC 17025, ISO22000, FSSC 22000, ISO45001, FSSAI, Kosher, HALAL, COPP, WHO-GMP certified and Written Confirmation (WC) for export to Europe is available. The manufacturers suppliers and exporters observe WHO Good Manufacturing Practices and Good Laboratory Practices.
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