3913.90.20 - Polysaccharides and their derivatives

This HTS category, 3913.90.20, encompasses **polysaccharides and their chemically modified derivatives** that are not elsewhere specified or included within Chapter 39, and are in their primary forms. Polysaccharides are complex carbohydrates made up of long chains of monosaccharide units. This category includes naturally occurring polysaccharides such as starches, celluloses, and gums, as well as those that have undergone chemical modification to alter their properties. Examples could include purified natural gums or modified celluloses intended for industrial use as thickeners, stabilizers, or binders.

Distinguishing this category from its sibling, 3913.90.10.00 (Chemical derivatives of natural rubber), is crucial. While both fall under the broader heading of modified natural polymers, 3913.90.10.00 specifically pertains to modifications of natural rubber, whereas 3913.90.20 focuses on a distinct class of natural polymers: polysaccharides. Therefore, materials derived from natural rubber, regardless of their modification, will be classified under 3913.90.10.00, not this category.

The subcategories within 3913.90.20 serve to further refine the classification based on specific types of polysaccharides. 3913.90.20.15 covers **Xanthan gum**, a specific and widely used polysaccharide produced by bacterial fermentation, often employed as a thickener and stabilizer in various industries. The residual portion of this category, 3913.90.20.90, is designated for "Other" polysaccharides and their derivatives that do not meet the criteria for Xanthan gum, ensuring comprehensive coverage for all unclassified polysaccharide-based materials within this section.