Cellosize ER-37M Hydroxyethyl cellulose Dow Chemical Rheology Modifier/ Thickener >> Cellulosic, non associative >> Hydroxyethyl cellulose (HEC) Coatings >> Waterborne Architectural / Decorative General Industrial /Maintenance Soluble in hot or cold water Medium-high molecular weight, enzyme-resistant cellulosic polymer. Used to thicken latex paints. Contains fumed silica as a flow-aid. Medium-high molecular weight, enzyme-resistant cellulosic polymer. Used to thicken latex paints. Contains fumed silica as a flow-aid.