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Purified Talc and Talc Dusting Powder
CAS Number: 14807-96-6
Molecular Formula: --
Molecular Weight: --
Purified Talc and Talc Dusting Powder
Talc USP NF Grade Specifications
Talc is a powdered, selected, natural, hydrated magnesium silicate. Pure talc has the formula Mg3Si4O10(OH)2. It may contain variable amounts of associated minerals among which chlorites (hydrated aluminum and magnesium silicates), magnesite (magnesium carbonate), calcite (calcium carbonate), and dolomite (calcium and magnesium carbonate) are predominant.
Identification:
A: The IR spectrum of a potassium bromide dispersion of it exhibits maxima at 3677 ± 2 cm –1, at 1018 ± 2 cm–1, and at 669 ± 2 cm–1.
B: Mix about 200 mg of anhydrous sodium carbonate with 2 g of anhydrous potassium carbonate, and melt in a platinum crucible. To the melt add 100 mg of the substance under test, and continue heating until fusion is complete. Cool, and transfer the fused mixture to a dish or beaker with the aid of about 50 mL of hot water. Add hydrochloric acid to the liquid until effervescence ceases, then add 10 mL more of the acid, and evaporate the mixture on a steam bath to dryness. Cool, add 20 mL of water, boil, and filter the mixture: [NOTE—Save the insoluble residue for use in Identification test C.] To 5 mL of the filtrate add 1 mL of 6 N ammonium hydroxide and 1 mL of ammonium chloride. Filter, if necessary, and add 1 mL of dibasic sodium phosphate to the filtrate: a white crystalline precipitate of magnesium ammonium phosphate is formed.
C: In a lead or platinum crucible and using a copper wire, mix about 100 mg of the insoluble residue as obtained in Identification test B with about 10 mg of sodium fluoride and a few drops of sulfuric acid to give a thin slurry. Cover the crucible with a thin transparent plate of plastic under which a drop of water is suspended, and warm gently. Within a short time, a white ring is rapidly formed around the drop of water.
Microbial limits: If intended for topical administration, the total aerobic microbial count does not exceed 100 cfu per g, and the total combined molds and yeasts count does not exceed 50 cfu per g. If intended for oral administration, the total aerobic microbial count does not exceed 1000 cfu per g, and the total combined molds and yeasts count does not exceed 100 cfu per g.
Acidity and alkalinity: Boil 2.5 g of Talc with 50 mL of carbon dioxide-free water under reflux. Filter under vacuum. To 10 mL of the filtrate, add 0.1 mL of bromothymol blue. Not more than 0.4 mL of 0.01 N hydrochloric acid is required to change the color of the indicator. To 10 mL of the filtrate, add 0.1 mL of phenolphthalein: not more than 0.3 mL of 0.01 N sodium hydroxide is required to change the color of the indicator to pink.
Loss on ignition: Weigh accurately about 1 g, and ignite at 1075 ± 25C to constant weight: it loses not more than 7.0% of its weight.
Water-soluble substances: To 10.0 g add 50 mL of carbon dioxide-free water, heat to boiling, and boil under a reflux condenser for 30 minutes. Allow to cool, filter, and dilute with carbon dioxide-free water to 50.0 mL: the filtrate is neutral to litmus paper. Evaporate 25.0 mL of the filtrate to dryness, and dry at 105C for 1 hour: the weight of the residue does not exceed 5 mg (0.1%).
Limit of iron: To pass the test.
Limit of lead: To pass the test.
Limit of calcium: To pass the test.
Limit of aluminum: : To pass the test.
Absence of asbestos: To pass the test.
Content of magnesium: To pass the test.
Talc FCC Food Grade Specifications
INS: 553(iii) CAS 14807-96-6
DESCRIPTION
Talc occurs as a white to gray-white, unctuous powder. It is a naturally occurring form of hydrous magnesium silicate containing varying proportions of such associated minerals as alpha-quartz, calcite, chlorite, dolomite, kaolin, magnesite and phlogopite. Talc derived from deposits that are known to contain associated asbestos is not food grade. It is insoluble in water and in solutions of alkali hydroxides, but is slightly soluble in dilute mineral acids.
REQUIREMENTS
Identification
A. The X-ray diffraction pattern of a random powder sample exhibits intense reflections at the following d values: 9.34A, 4.66 A, and 3.12 A .
B. The infrared absorption spectrum of a potassium bromide dispersion of the sample exhibits major peaks at approximately 1015 cm−1 and 450 cm−1.
Acid-Soluble Substances: (as SO4) Not more than 2.5%.
Arsenic: Not more than 3 mg/kg.
Free Alkali: (as NaOH) Not more than 1%.
Lead: Not more than 5 mg/kg.
Loss on Drying: Not more than 0.5%.
Loss on Ignition: Not more than 6.0%.
Soluble Salts: Not more than 0.2%.
We also supply Purified Talc and Talc Dusting Powder of BP Ph Eur Grade.
Please visit SDS Safety Data Sheet of Purified Talc and Talc Dusting Powder 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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