CAS #: 9004-32-4, Sodium Carboxymethyl Cellulose (CMC) is the sodium salt of carboxymethyl cellulose, also referred to as Cellulose Gum, which is an anionic cellulose ether with macromolecular structure. It is odourless, tasteless, and non-toxic with white or faint yellow powder. It can easily be dissolved in water, and transferred into the colloidal solution; and it can't be dissolved in ethanol, ether, acetone, or other organic solvents.