HS Code for CMC

Carboxymethylcellulose (CMC) and its salts are classified under HS code 3912.31. This classification falls under Chapter 39 (Plastics and articles thereof), specifically within the heading for cellulose and its chemical derivatives. CMC is a cellulose ether produced by reacting cellulose with chloroacetic acid. The classification 3912.31 is specific to the carboxymethyl group and its salts (such as Sodium Carboxymethyl Cellulose). The product is typically traded in primary forms, such as white or off-white powders or granules, which are soluble in water and used as thickeners, binders, and stabilizers in food, pharmaceuticals, and industrial applications. The classification is driven by the chemical structure of the polymer, where the hydroxyl groups of the cellulose backbone are partially substituted with carboxymethyl groups.

Products Included

• Sodium Carboxymethyl Cellulose (Na-CMC)
• Purified CMC powder
• Technical grade CMC for oil drilling
• Food-grade cellulose gum
• CMC salts in primary forms

Common Misclassification

CMC is often misclassified under 3912.39, which is the residual category for "other" cellulose ethers like methylcellulose or hydroxypropyl cellulose. Another common mistake is 3913.90 (other natural polymers), but since CMC is a chemically modified derivative of cellulose, it is strictly governed by the 3912 heading. In some cases, if the CMC is prepared as a finished glue or adhesive, it might be misclassified under 3506, but in its primary powder form, 3912.31 is correct.

FAQ

What is the HS code for CMC?

The HS code for Carboxymethylcellulose (CMC) and its salts is 3912.31.

Is food-grade CMC classified differently than industrial-grade?

No, both food-grade and industrial-grade CMC are classified under 3912.31, provided they are in primary forms and not mixed with other ingredients that change the product's essential character.