CMC · General material information
CMC · Carboxymethyl cellulose
Understand CMC, its common sodium salt, the functions it can provide and the conditions to define before comparing grades.
General material reference, not a JNP grade specification or application-validation report. The properties below principally describe sodium carboxymethyl cellulose (Na-CMC).
Identity and manufacturing background
CMC and Na-CMC
CMC is a cellulose ether bearing carboxymethyl groups. Its commonly used sodium salt is called sodium carboxymethyl cellulose, Na-CMC or cellulose gum; CAS 9004-32-4 and INS 466 identify this sodium-salt material.
Polymer, not one fixed molecule
Degree of substitution (DS) describes the average number of substituted hydroxyl groups per glucose unit. Chain length and substitution vary: a single small-molecule formula or molecular weight is not a universal CMC specification.
How it is made
Cellulose is alkalized, etherified with a chloroacetate reagent, then processed and purified for the intended grade. Purity and residual salts depend on the product; this is not a description of JNP's manufacturing process.
Physical and solution properties
Appearance and water behavior
Na-CMC is typically a white to cream powder or granulate. It is hygroscopic and forms viscous aqueous solutions after suitable dispersion and hydration. Ordinary grades are not selected as ethanol-soluble binders.
Anionic character
Unlike nonionic MC or HPMC, Na-CMC carries ionic groups. Acidity, salts, multivalent ions and other charged ingredients can change its behavior; compatibility must be checked in the actual formulation.
Viscosity is conditional
Concentration, temperature, shear, hydration time and grade affect the result. Compare viscosity only with the same preparation procedure, instrument, spindle/speed or shear rate, temperature and units.
Functions and application areas
Food and beverages
Selected grades are used for thickening, texture and suspension or protein stabilization. The food category, process and destination-market requirements determine what must be evaluated.
Personal care and pharmaceuticals
CMC can serve as a rheology modifier or binder. Required purity, microbiological controls and the intended product route must be specified; general CMC is not automatically suitable for medicinal use.
Paper, textiles and ceramics
Industry references describe water retention, film formation, sizing and binding. Compare processing behavior and the relevant finished-product criteria rather than choosing by viscosity alone.
Detergents and water-based coatings
Reported functions include soil anti-redeposition and control of flow or suspension. Compatibility with surfactants, pigments and electrolytes is formulation-dependent.
Drilling and mineral processing
Specialized grades are used for drilling-fluid rheology or fluid-loss control and mineral-processing functions. Required test methods and fluid composition must be stated.
Battery materials
Specialized CMC grades are used in aqueous electrode processing. Purity, ionic contamination, slurry behavior and electrode testing require separate qualification.
Information needed for grade selection
Identity, substitution and purity
Specify sodium-salt identity, required DS, purity and residual-salt limits where relevant. Include particle size, moisture and the applicable product standard with its edition.
Liquid system and processing
Describe water quality, pH, salt content, other polymers, solids, mixing sequence, temperature and holding time. Provide the current material and its specification if available.
Comparable acceptance criteria
Define the viscosity method and the practical result to test: suspension, flow, binding, water retention or another requirement. Agree a baseline and acceptance criteria before a sample comparison.
Dispersion, storage and handling
Disperse before evaluating
Avoid adding a large powder mass that hydrates only on the outside. Establish mixing and hydration conditions, then check the fully prepared solution. There is no universal addition rate or mixing time for every grade.
Protect powder and solution
Keep powder sealed and protected from moisture and contamination. Review the applicable SDS for dust and spill controls. Manage solution hygiene and holding time; packaging and shelf life must come from the actual supplier's documents.
Important identity and use boundaries
Not an automatic MC/HPMC replacement
A shared thickening function does not establish equivalent thermal behavior, salt response or finished-product performance. CMC should not be presented as a proven replacement for a named MC or HPMC grade.
Not croscarmellose sodium
Crosslinked sodium carboxymethyl cellulose is a distinct modified material. Do not interchange its identity, specifications or application claims with ordinary soluble Na-CMC.
INS 466 is not a product approval
An additive identifier does not certify a supplier, approve a JNP grade or authorize every use and market. Confirm the applicable requirements and supporting documents separately.
Documents to confirm before testing or buying
Product and grade
Request the applicable TDS and SDS, then the exact-grade specification with units, methods and revision. A public encyclopedia cannot replace these documents.
Batch and intended use
Match the sample or shipment to its batch CoA. Request applicable purity, microbiological, contaminant, certification and market-use evidence for the intended application.
JNP commercial details
JNP CMC series, grade codes, guaranteed ranges, samples, packaging, minimum order, price and lead time remain to be confirmed.
Sources and scope
Wikipedia and ChemBK provide the starting references. FAO/JECFA verifies the sodium-salt identity; manufacturer publications provide independent technical context, not evidence for JNP products. Checked 13 September 2026.