Gel 540P Magnesium aluminium silicate 12174-11-7 Zemex Industrial Minerals Extenders / Fillers >> Aluminium silicate Rheology Modifiers / Thickeners >> Organoclay >> Attapulgite ADHESIVE >> Water-based SEALANT GEL 540P is a finely ground attapulgite clay (hydrous magnesium aluminum silicate. GENERAL INFORMATION GEL 540P is widely used to build viscosity and gel structure in adhesive formulations. GEL 540P is a finely ground attapulgite clay used to impart thixotropic properties to aqueous media. The material provides excellent low shear viscosity and suspension properties in water and other polar liquids. The performance of the material is not affected by dissolved electrolytes. Stable, high quality and finely ground attapulgite clay (hydrous magnesium aluminium silicate). Used to build viscosity and suspension properties in adhesives.