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Talc is a mineral composed of hydrated magnesium silicate with the chemical formula H2Mg3(SiO3)4 or Mg3Si4O10(OH)2. In loose form, it is the widely used substance known as baby powder (aka talcum). It occurs as foliated to fibrous masses, and in an exceptionally rare crystal form. It has a perfect basal cleavage, and the folia are non-elastic, although slightly flexible.
| Product Name : | TALC IP |
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| Sr No | Test | Specifications |
| 1 | Description | A white or almost white powder, Free from grittiness; readily adheres to the skin; unctuous to the touch; odorless |
| 2 | Solubility | Practically insoluble in water, in ethanol (96 per cent) and in dilute solutions of acids and alkali hydroxides. |
| 3 | Identification | A). The particle are not notably stained by a 0.1 % w/v solution of methylene blue in ethanol (95%) B). A white, crystalline precipitate is produced. C). Gives the reaction of silicates |
| 4 | Acidity or alkalinity | Not more than 0.3 ml of 0.1 M hydrochloric acid is required |
| 5 | Iron | Not more than 10 ppm. |
| 6 | Acid soluble substance | Not more than 2.0 % w/w |
| 7 | Water-soluble substances | The residue weighs not more than 10 mg. |
| 8 | Carbonate | No effervescence is produced |
| 9 | Chloride | Not more than 250 pm. |
| 10 | Organic compounds | The residue obtained in the test for loss on drying is not more than slightly yellow or grey. |
| 11 | Loss on drying | Not more than 1.0 % w/w at 180°C for 1 hour. |
| Product Name : | TALC USP |
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| Sr.No | Test | Specifications |
| 1 | Description | A light, homogeneous, white or almost white powder, greasy to the touch (non abrasive) |
| 2 | Solubility | Practically insoluble in water, in ethanol (96 per cent) and in dilute solutions of acids and alkali hydroxides. |
| 3 | Identification | A) By infrared absorption spectrophotometry B) A white, crystalline precipitate of magnesium ammonium phosphate is formed. C) A white ring is rapidly formed around the drop of water. |
| 4 | Microbial limit a) Total aerobic microbial count b) Total combined molds and yeasts count | Not more than 1000 cfu/g Not more than 100 cfu/g |
| 5 | Acidity and alkalinity | To comply the test |
| 6 | Loss on ignition | Not more than 7.0% w/w |
| 7 | Water soluble substances | Not more than 0.1% w/w |
| 8 | Limit of Iron | Not more than 0.25 % w/w |
| 9 | Limit of Lead | Not more than 0.001% w/w |
| 10 | Limit of calcium | Not more than 0.9% w/w |
| 11 | Limit of aluminum | Not more than 2.0 % w/w |
| 12 | Absence of asbestos | To comply the test |
| 13 | Content of magnesium | 17.0% to 19.5% of magnesium |
| Product Name : | TALC BP |
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| 1 | Characters | A light, homogeneous, white or almost white powder, greasy to the touch (non abrasive), practically insoluble in water, in ethanol (96 per cent) and in dilute solutions of acids and alkali hydroxides. |
| 2 | Identification First identification A. Second identification B, C. | A) By infrared absorption spectrophotometry B) A white, crystalline precipitate is formed. C) A white, crystalline precipitate is formed. |
| 3 | Acidity or alkalinity | To comply the test |
| 4 | Water-soluble substances | Not more than 0.2 % w/w |
| 5 | Aluminium | Not more than 2.0 % w/w |
| 6 | Calcium | Not more than 0.9 % w/w |
| 7 | Iron | Not more than 0.25 % w/w |
| 8 | Lead | Not more than 10 ppm |
| 9 | Magnesium | 17.0 % w/w to 19.5 % w/w |
| 10 | Loss on Ignition. | Not more than 7.0 % w/w at 1050-1100 °C. |
| 11 | Microbial contamination a) Total aerobic microbial count b) Total combined molds and yeasts count | Not more than 1000 cfu/g Not more than 100 cfu/g |