CELLOSIZE™ QP-100MH Hydroxyethyl Cellulose (HEC) is the highest molecular weight cellulosic polymer offered by The Dow Chemical Company, and aqueous solutions of CELLOSIZE™ QP-100MH HEC are the most pseudoplastic (non-Newtonian) in their rheology. CELLOSIZE™ QP-100MH HEC is used as a thickener for water-borne systems including latex paints.