3912.31.00.10 - Containing not less than 90 percent by weight of carboxymethylcellulose

This HTS classification specifically covers carboxymethylcellulose (CMC) and its salts when they are contained in a mixture or product with not less than 90 percent by weight of carboxymethylcellulose. This means the primary component and defining characteristic of the substance at this level must be CMC. Such forms are typically found as powders, granules, or viscous liquids, widely utilized for their thickening, stabilizing, and binding properties in various industrial applications including food, pharmaceuticals, textiles, and paper manufacturing.

The distinction between HTS code 3912.31.00.10 and its sibling category 3912.31.00.90 lies in the concentration of carboxymethylcellulose. While this subheading addresses products where CMC is overwhelmingly dominant (90% or more by weight), the sibling category "Other" would encompass mixtures or preparations where carboxymethylcellulose is present but at a lower concentration, or where it is combined with significant proportions of other materials that do not meet the 90% threshold. The precise percentage is therefore a critical determinant for accurate classification.

As this is a leaf node within the HTS structure, there are no further subcategories that divide this specific classification. Therefore, the focus for classification at this level is on the exact chemical identity of the cellulose derivative and its predominant presence within the product, as defined by the 90 percent by weight criterion. Importers and exporters should ensure their documentation accurately reflects the composition of the goods to comply with this specific HTS entry.