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Appearance
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A clear, colourless or almost colourless, odourless; very hygroscopic,syrupy liquid
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Assay (on anhydrous basis)
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98 - 101%
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Identification as per IP
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To comply
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Clarity (50% w/v in distilled water)
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Clear
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Colour (10 ml of 50% w/v solution diluted to 25 ml)
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Colorless
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Refractive index (20°C; 589 nm)
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1.470 - 1.475
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Acidity
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Max 0.2 ml of 0.1 N NaOH required for 50 ml of 50% w/v solution
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Alkalinity
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NIL
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Heavy metal (as Pb)
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Max 0.0005%
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Iron (Fe)
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Max 0.0004%
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Chloride (Cl)
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Max 0.0025%
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Sulphate (SO4)
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Max 0.003%
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Aldehyde and reducing substance
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To Pass IP test
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Ester
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Min 8.0 ml of 0.1M HCl required to decolorise the 50 ml of 50% w/v solution of glycerin in water
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Ethlylene glycol, diethylene glycol and related substances
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To comply
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Sugar
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To pass IP test
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Sulphated ash
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Max 0.01%
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Water (H2O)
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Max 2%
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