Gel 420P Magnesium aluminium silicate 12174-11-7 Zemex Industrial Minerals Extenders / Fillers >> Aluminium silicate Rheology Modifiers / Thickeners >> Organoclay >> Attapulgite ADHESIVE >> Water-based SEALANT GEL 420P is a finely ground attapulgite clay (hydrous magnesium aluminum silicate).GEL 420P is used to build viscosity and suspension properties in paints, adhesives, sealants, and foundry coating systems. It is also used in conjunction with a surfactant to build viscosity and gel structure in oil-based products, such as asphalt roof coatings.GEL 420P is a finely ground, high quality attapulgite clay used to impart thixotropic properties to water and other polar liquids. GEL 420P is also used in combination with surfactants to build viscosity and gel structure in oil-based systems. Stable, high quality and finely ground attapulgite clay (hydrous magnesium aluminium silicate). Used to build viscosity and suspension properties in adhesives and sealants.