HS Code for Carboxymethylcellulose

Carboxymethylcellulose (CMC) and its salts are classified under HS code 391231. This substance is a chemical derivative of cellulose, specifically a cellulose ether, where carboxymethyl groups are bound to some of the hydroxyl groups of the glucopyranose monomers. It is produced by the reaction of cellulose with alkali and chloroacetic acid. Under the Harmonized System, Chapter 39 covers plastics and polymers. Heading 3912 is dedicated to cellulose and its chemical derivatives not elsewhere specified. Subheading 391231 specifically identifies carboxymethylcellulose and its salts, such as Sodium CMC. To fall under this code, the product must be in a "primary form," which according to Note 6 to Chapter 39 includes liquids, pastes, blocks, irregular shapes, lumps, powders, granules, and flakes. CMC is widely used as a rheology modifier, thickener, and stabilizer in food (E466), pharmaceuticals, and industrial applications like oil drilling muds. The classification remains the same regardless of the grade (technical, purified, or food grade) as long as it remains a primary form of the polymer.

Products Included

• Sodium carboxymethylcellulose (NaCMC)
• Purified CMC powder
• Technical grade CMC granules
• CMC salts in primary forms
• Carboxymethylcellulose solutions in water (primary form)

Common Misclassification

CMC is sometimes misclassified under 391239, which is the residual category for "other" cellulose ethers like Methylcellulose or Hydroxypropyl cellulose. Because CMC has its own specific subheading (391231), using 391239 is an error. It may also be confused with 3402 if it is part of a prepared detergent mixture, but as a pure chemical derivative in primary form, 391231 is correct.

FAQ

What is the HS code for Carboxymethylcellulose?

The HS code for Carboxymethylcellulose and its salts in primary forms is 391231.

Does this code include food-grade CMC?

Yes, food-grade CMC is classified under 391231, provided it is in a primary form like powder or granules and not mixed into a finished food preparation.