3806.90.00.00 - Other

This HTS classification, 3806.90.00.00, encompasses "Other" miscellaneous chemical products that fall within the broader category of rosin and resin acids, and their derivatives, as well as rosin spirit and rosin oils, and run gums. It serves as a residual category for products that are related to rosin and resin acids but do not fit into the more specifically defined subheadings within Chapter 3806. These can include a variety of modified resins, synthetic resins derived from natural resin acids, or complex mixtures where rosin or resin acids are a significant but not exclusively defining component.

This category is distinct from its siblings, 3806.10.00 (Rosin and resin acids), 3806.20.00.00 (Salts of rosin, of resin acids or of derivatives of rosin or resin acids, other than salts of rosin adducts), and 3806.30.00.00 (Ester gums). Unlike the direct classification of rosin and resin acids themselves, or their salts, or esterified forms, the "Other" category is for products that have undergone further processing or modification, or are complex formulations that do not neatly align with the primary chemical identity or a single transformation type covered by the more specific headings.

As a leaf node, this category has no further subdivisions. Therefore, classification into 3806.90.00.00 relies on a careful analysis of the product's composition and its relation to the primary materials described in the preceding headings within 3806. Items classified here are typically those where the rosin or resin acid derivative nature is present but is not the sole defining characteristic or where the modification goes beyond simple salt formation or esterification. Examples might include certain modified natural resins used as tackifiers in adhesives or as binders in specific industrial applications, provided they are not more appropriately classified elsewhere.