Cellulose gum, or sodium carboxymethyl cellulose (sodium CMC), is a multi-functional ingredient that can be used as a thickener, binder, emulsifier and stabilizer in food with the European food additive number E466. Together with xanthan gum, they’re the most used and common thickener among others in food applications.

http://www.chinafooding.com/Carboxy_Methyl_Cellulose-CMC