3906.90 - Other:

This HTS category, 3906.90, encompasses acrylic polymers in their primary forms, excluding those specifically classified under 3906.10 as poly(methyl methacrylate). It broadly covers other types of acrylic polymers, such as copolymers of acrylonitrile, acrylic acid, methacrylic acid, and their derivatives, when presented in bulk forms like powders, granules, flakes, or blocks. These materials serve as foundational components for a wide array of manufactured goods, finding applications in adhesives, coatings, textiles, and specialized plastics.

The key differentiator for this category lies in its residual nature within the broader "Acrylic polymers in primary forms" chapter. While 3906.10 focuses on the specific polymer of methyl methacrylate, 3906.90 captures all other acrylic polymer types. Therefore, classification here depends on identifying the presence of acrylic monomers as the principal component and ensuring the polymer is not exclusively poly(methyl methacrylate).

Within this category, further subdivisions exist to refine classification based on specific properties and intended uses. The subcategory 3906.90.10.00, for instance, addresses "Elastomeric" acrylic polymers, which are characterized by their rubber-like elasticity. The remaining "Other" subcategory would then capture all other acrylic polymers not specifically designated as elastomeric, necessitating a careful examination of the polymer's chemical composition and physical attributes for accurate tariff placement.