Hectorite 334 Hectorite 1302-78-9 Whittaker Rheology Modifiers / Thickeners >> Organoclay >> Hectocrite SEALANT Technical grade hectorite clays are used as thickeners and rheological modifiers in water-based paints, cleaning compounds, oven cleaners, polishes, sealants and other areas. Hectorite clay. Used as a thickener and a rheological modifier in sealants.