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Description
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A white, or almost white powder, free from grittiness, readily adhere to the skin, unctuous to the touch
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Solubility
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Practically insoluble in water and in dilute solutions of acids and in alkali hydroxides
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Identification
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-
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Identification 'A' ( by IR)
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It should shows absorption bands at 3677+2cm -1, 1018+2cm -1 and 669+ 2cm-1
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Identification 'B'
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A white crystalline precipitate should be formed
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Identification 'C'
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Residue obtained in identification B, should gives the reaction of silicates
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Acidity or alkalinity
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The solution should required not more than 0.3 ml of 0.1M hydrochloric acid to make it acidic
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Iron
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NMT 10 ppm
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Acid soluble matter
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Max 2.0%
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Water soluble substances
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The residue weight should be maximum 10 mg
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Carbonate
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No effervescence should produced
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Chloride (Cl)
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Max 250 ppm
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Organic compounds
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The residue obtained in the test for loss on drying should not more than slightly yellow or grey
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Loss on drying (at 180°C; 1 hrs)
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Max 1.0%
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Microbial contamination
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The total aerobic viable count should not more than 103 CFU and total fungal count should not more than 102 CFU per g
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