3902.20.10.00 - Elastomeric

This HTS category, 3902.20.10.00, specifically covers polyisobutylene when it exhibits elastomeric properties. Elastomeric polymers are characterized by their ability to return to their original shape after being stretched or deformed. This includes materials that are inherently flexible and rubber-like, often used in applications requiring elasticity, such as sealants, adhesives, and certain types of flexible tubing. The key distinguishing factor here is the inherent elasticity of the polyisobutylene, setting it apart from polyisobutylene with other physical properties.

In contrast to its sibling category, 3902.20.50.00, which covers "Other" polyisobutylene, this specific subheading is reserved for only those forms that demonstrate elastomeric characteristics. Therefore, if the polyisobutylene is rigid, brittle, or does not possess significant elastic recovery, it would fall under the "Other" classification. This distinction is crucial for accurate tariff application, as the intended use and physical properties dictate the correct classification.

As this node is a leaf node within the HTS structure, there are no further subcategories. Classification within this heading is definitive based on the material being polyisobutylene and its identified elastomeric properties. Importers and exporters should consult material specifications and product literature to confirm the elastomeric nature of the polyisobutylene to ensure correct declaration.