3913.90.50.00 - Other 🖩

This HTS subheading, 3913.90.50.00, encompasses "Other" modified natural polymers that are not otherwise specified or included within Chapter 39, and are presented in their primary forms. This broad category serves as a residual classification for natural polymers that have undergone chemical modification, resulting in altered properties, but do not fall under the more specific subheadings for chemical derivatives of natural rubber or polysaccharides and their derivatives. Examples may include certain modified starches, cellulose derivatives not covered elsewhere, or other chemically altered natural substances intended for industrial use.

Crucially, this subheading distinguishes itself by its exclusionary nature. It is intended for modified natural polymers that do not precisely fit the descriptions of sibling categories. For instance, while 3913.90.10.00 specifically covers chemical derivatives of natural rubber (such as vulcanized rubber in primary forms), and 3913.90.20 covers polysaccharides and their derivatives (like modified starches or alginic acid esters), this subheading captures any other qualifying material that doesn't meet those specific criteria. The key is that the material must be a modified natural polymer and not classifiable under a more precise heading.

As this is a leaf node within the HTS structure, there are no further subcategories to introduce. Therefore, classification into 3913.90.50.00 relies heavily on a thorough examination of the material's chemical composition and its derivation from natural polymers, ensuring it has been chemically modified and does not fit the criteria of any other HTS heading or subheading within Chapter 39. The "primary forms" stipulation is also critical, referring to substances in bulk such as powders, granules, pellets, or liquids.