• British Pharmacopoeia Volume IV
  • Appendices
  • Appendix I A. General Reagents

Silica Gel, Anhydrous
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Silica Gel, Anhydrous (112926-00-8)

Partly dehydrated polymerised, amorphous silicic acid, absorbing at 20 °C about 30 per cent of its mass of water. Practically insoluble in water, partly soluble in solutions of sodium hydroxide. It contains a suitable indicator for detection of the humidity status, for which the colour change from the hydrated to anhydrous form is given on the label.