4002.19.00.19 - Other

This HTS classification, 4002.19.00.19, pertains to "Other" types of synthetic rubber within the broader category of styrene-butadiene rubber (SBR) and carboxylated styrene-butadiene rubber (XSBR), specifically those containing 50 percent or less styrene by weight of the dry polymer. This residual classification captures SBR and XSBR that do not fit into the more specific sibling categories, such as styrene-butadiene-styrene block copolymers (SBS) in granular or powdered form, or E-SBR and S-SBR when presented in bales.

The distinction from sibling categories hinges on the specific chemical structure, polymerization method, physical form, and intended application of the rubber. While 4002.19.00.14 covers thermoplastic elastomers like SBS in non-baled forms, and 4002.19.00.15 and 4002.19.00.16 address E-SBR and S-SBR specifically when packed in bales, this classification serves as a catch-all for other forms or variants of SBR and XSBR that meet the styrene content criteria but do not conform to those precise descriptions. Examples might include SBR or XSBR in latex form, or in specific non-baled, non-granular, or non-powdered forms not otherwise enumerated.

As this is a leaf node within the HTS, there are no further subdivisions. Therefore, classification under 4002.19.00.19 requires careful examination of the product's properties and how it deviates from the more specifically defined categories at the same level to ensure accurate customs treatment.