Glycerol Ph.Eur 25LT Go Back


: 56-81-5

Molecular Formula


Molecular Weight

: 92.09
Description: Syrupy liquid, unctuous to the touch, colourless or almost colourless, clear, very hygroscopic.
Solubility: Miscible with water and ethanol(96%),slightly soluble in acetone, practically insoluble in fatty oils and in essential oils
Identification A (By Refractive index, 20±0.5°C): 1.470 - 1.475
Identification B (By IR): IR spectra of the sample solution should be concomitant with IR spectra of the reference spectrum of glycerol (85%)
Identification C (By Relative density): 1.258-1.268
Appearance of solution: Clear and colorless solution
Acidity or Alkalinity: Not more than 0.2ml of 0.1M sodium hydroxide is required to change the color of the indicator to pink.
Refractive index,20° C: 1.470 - 1.475
Aldehydes: NMT 10ppm
Ester: Not less than 8.0 ml of 0.1M hydrochloric acid should required to the change the colour of the indicator.
Impurity A (Diethylene glycol): NMT 0.1%
Related substances (Any impurity with a retention time less than the retention time of glycerol ): NMT 0.1%
Related substances: Total of all impurities with retention times greater than the retention time of glycerol: NMT 0.5%
Halogenated compounds: NMT 35ppm
Sugars: The solution remains blue and no precipitate should form.
Chlorides: NMT 10ppm
Water: NMT 2.0%
Sulphated ash: NMT 0.01%
Assay (anhydrous substance): 98.0% - 101.0% m/m
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