4010.39.30.00 - With textile components in which vegetable fibers predominate by weight over any other single textile fiber

This HTS classification applies to conveyor or transmission belts and belting made from vulcanized rubber, specifically those where the textile components are characterized by a predominance of vegetable fibers by weight over any other single textile fiber. This means that when analyzing the textile reinforcement within the rubber belting, the weight of vegetable fibers (such as cotton, flax, or jute) must exceed the weight of any other single type of fiber present, whether natural or synthetic.

This category is distinguished from its sibling, 4010.39.30.00, which covers belts with textile components where man-made fibers (like polyester, nylon, or rayon) predominate by weight. It also differs from other "other" categories within transmission belts by its specific requirement regarding the *type* and *predominance* of vegetable fibers in the textile reinforcement. The intention is to isolate belting based on its specific material composition of the supporting textile structure.

As this is a leaf node in the HTS classification, there are no further subcategories. Classification under this heading is definitive once the criteria of vulcanized rubber construction and the predominance of vegetable fibers by weight in the textile components are met. Examples of products falling here might include certain industrial conveyor belts or agricultural machinery belting where cotton or flax is used as the primary reinforcing fiber.