Silica 60. Specific surface (BET) ~500 m²/g. Mean pore size 60 Å. Specific pore volume 0.75 ml/g. Particle size 5 to 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). Binders: highly polymeric products; which are stable in almost all organic solvents and resistant towards aggressive visualisation reagents. Binder system for Polygram® sheets is also completely stable in purely aqueous eluents. With fluorescent indicator (UV 254).