3913.90.20.90 - Other

This HTS category, 3913.90.20.90, encompasses "Other" polysaccharides and their derivatives that are not elsewhere specified or included within Chapter 39. It covers natural and modified natural polymers, such as alginic acid and hardened proteins, when presented in their primary forms. This classification is intended for substances that do not fit into more specific subcategories of natural polymers, particularly within the realm of polysaccharides and their derivatives.

Within the scope of "Other" polysaccharides and their derivatives, this specific code serves as a residual category for products not explicitly listed. It should be distinguished from sibling categories such as 3913.90.20.15, which specifically covers Xanthan gum. While both are types of polysaccharides, 3913.90.20.90 is for all other polysaccharides and their derivatives that do not meet the specific criteria for classification under Xanthan gum or any other more narrowly defined subcategories.

As this classification represents a leaf node, there are no further subcategories. Therefore, the practical classification under 3913.90.20.90 relies on a thorough analysis of the product's chemical composition and its exclusion from more specific classifications within Chapter 39, particularly within the natural polymers and their derivatives sections. Importers and exporters should confirm that their product is indeed a polysaccharide or a derivative thereof, is in its primary form, and does not qualify for a more precise tariff designation.