British Pharmacopoeia Volume V
Appendices
Appendix I A. General Reagents

Silica Gel for Chromatography, End-capped Octylsilyl

Chromatographic reagent grade of commerce.

A very finely divided (3 µm to 10 µm) silica gel chemically modified at the surface by the bonding of octylsilyl groups. To minimise any interaction with basic compounds, it is carefully end-capped to cover most of the remaining silanol groups. The particle size is indicated after the name of the reagent in tests where it is used.