4002.19.00.15 - Styrene-butadiene rubber produced by emulsion polymerization (E-SBR) in bales

This HTS classification, 4002.19.00.15, specifically covers Styrene-butadiene rubber (SBR) that has been produced through an emulsion polymerization process. This material, commonly referred to as E-SBR, is typically found in its primary form as bales. E-SBR is a versatile synthetic rubber widely used in various industrial applications, including tire manufacturing, footwear, and mechanical goods. The key classification criterion here is the emulsion polymerization method used in its production.

This category is distinguished from its sibling classifications primarily by the polymerization method and physical form. For instance, 4002.19.00.14 covers styrene-butadiene-styrene block copolymers produced by solution polymerization and presented in granules, crumbs, or powders, whereas this entry focuses on emulsion-polymerized SBR in bales. Similarly, 4002.19.00.16 covers styrene-butadiene rubber produced by solution polymerization (S-SBR) also in bales, highlighting the critical distinction between emulsion and solution polymerization techniques. The "Other" category (4002.19.00.19) serves as a residual for other forms or types of styrene-butadiene rubber not specifically enumerated within the preceding subheadings.

As this classification represents a leaf node within the HTS structure, there are no further subdivisions or subcategories. Therefore, the focus remains on clearly defining the scope of E-SBR in bales produced by emulsion polymerization and its position relative to other closely related synthetic rubber products. Classification within this subheading relies on confirming the production method (emulsion polymerization) and the physical presentation (bales) of the styrene-butadiene rubber.