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1
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Description
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A white fine bulky amorphous powder with faint odour
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2
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Solubility
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Practically insoluble in water, and in ether
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3
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Identification
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Shows test of Magnesium salts
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4
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Fluoride
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Not more than 10 ug/gm
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5
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Free
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Alkali Not more than 2.5 ml of 0.1 NHCL
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6
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Lead
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Not more than 10 ug/gm
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7
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Soluble Salt
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Not more than 75.0 mg
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8
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Heavy Metal
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Not more than 20 ug/gm
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9
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Loss on Drying
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Not more than 15 %
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10
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Loss On Ignition
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Not more than 15 %
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11
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pH
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7.0 to 10.8
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12
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Assay as MgO Assay as SiO2
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NLT 15 % NLT 67 %
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13
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Ratio of SiO2/MgO
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Between 2.5 to 4.50
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