Hydroxyethyl Cellulose;Hydroxyethyl cellulose ether;Hydroxyethyl ether cellulose;Natrosol;Natrosol 240JR;Natrosol 250 H;Natrosol 250 HHR;Natrosol 250 M;Natrosol L 250;Natrosol LR;HEC;hydroxyl ethyl cellulose;Hydroxy Ethyl Cellulose; CAS No . 9004-62-0