3904.90 - Other:

This HTS category, 3904.90, encompasses polymers of vinyl chloride or other halogenated olefins that do not fit into the more specific preceding subheadings within heading 3904. It is designed as a residual category for materials that are primarily composed of vinyl chloride or other halogenated olefins but lack the distinct characteristics or co-polymer structures defined elsewhere. This classification serves as a catch-all for such polymers when they are presented in their primary forms, such as powders, granules, or pellets.

The primary distinction of 3904.90 from its sibling categories lies in the absence of specific chemical compositions or structural definitions found in other subheadings. For instance, it excludes the pure poly(vinyl chloride) of 3904.10, the specifically defined vinyl chloride-vinyl acetate copolymers of 3904.30, and the vinylidene chloride polymers of 3904.50. Where other categories specify the precise co-monomers or polymerization structures, 3904.90 covers those that do not meet these narrower criteria, provided they are still polymers of vinyl chloride or other halogenated olefins.

Within this residual category, two distinct subcategories exist to further refine the classification. Subcategory 3904.90.10.00 addresses "Elastomeric" polymers, signifying those that exhibit rubber-like properties and can be stretched and returned to their original shape. The remaining materials that do not meet this elastomeric characteristic fall under the "Other" subcategory, 3904.90.50.00, ensuring a comprehensive coverage for all residual halogenated olefin polymers not otherwise specified.