Silica 60, specific surface (BET) ~ 500 m2/g, mean pore size 60 Å, specific pore volume 0.75 mL/g, particle size 5–17 µm; standard grade. Thickness of layer for analytical plates 0.25 mm, for preparative plates 0.5 and 1 mm. For 2 mm preparative layers a slightly coarser material is used. Indicators: manganese activated zinc silicate with green fluorescence for short-wave UV (254 nm). special inorganic fluorescent pigment with blue fluorescence for long-wave UV (366 nm). Binders: highly polymeric products, which are stable in almost all organic solvents and resistant towards aggressive visualisation reagents. The binder system for POLYGRAM sheets is also completely stable in purely aqueous eluents.