4002.19.00.14 - Styrene-butadiene-styrene block co- polymers produced by solution polymerization (SBS, thermoplastic elastormers), in granules, crumbs or powders

This HTS category specifically classifies styrene-butadiene-styrene block copolymers, commonly known as SBS thermoplastic elastomers, when presented in primary forms such as granules, crumbs, or powders. These materials are characterized by their unique block copolymer structure, which imparts both rubber-like elasticity and thermoplastic processability. The production method is a key differentiator, as this subheading applies only to those manufactured through solution polymerization, as opposed to other methods.

It is crucial to distinguish this category from its siblings, particularly 4002.19.00.15 and 4002.19.00.16. While those subheadings also deal with styrene-butadiene rubber, they are specific to E-SBR (emulsion polymerization) and S-SBR (solution polymerization) respectively, and are further differentiated by being presented in bales. This current category, 4002.19.00.14, focuses solely on the block copolymer (SBS) and its presentation in granular, crumb, or powder form, irrespective of whether it's a styrene-butadiene rubber or a block copolymer. The "Other" category at 4002.19.00.19 serves as a residual for any styrene-butadiene rubber falling under the "Other" designation that doesn't fit the specified forms or production methods of its siblings.

As a leaf node, 4002.19.00.14 does not have further subcategories. Classification within this heading hinges on the precise identification of the material as an SBS block copolymer and its physical form. Importers should ensure that the documentation clearly indicates the production method (solution polymerization) and the presentation of the material (granules, crumbs, or powders) to ensure correct classification and avoid discrepancies with related, but distinct, styrene-butadiene rubber classifications.