gelling, foaming and binding agent Carboxyalkyl Halogenated carboxylic acids Carboxymethyl cellulose (CMC) Chloroacetic acid -CH 2 COOH Cold/Hot water soluble Often used as its sodium salt , sodium carboxymethyl cellulose (NaCMC). The sodium carboxymethyl cellulose can be cross-linked to give the croscarmellose sodium for use as a disintegrant in pharmaceutical formulations.