Both coir and abaca fall under the single subheading 530500, so there is no separate tariff-line distinction between them at the HS6 level. However, at the US 10-digit level, the schedule may break out specific fibers; importers should verify the applicable 10-digit line for their specific fiber type. Commercially, coir is the fibrous husk of the coconut fruit, while abaca is extracted from the leaf sheaths of a banana-family plant native to the Philippines.

Ramie and other plant-based fibers in raw or minimally processed form may be subject to USDA APHIS phytosanitary requirements, particularly if they could harbor plant pests. Importers should check whether a phytosanitary certificate is required from the country of origin and confirm that the fiber has been processed sufficiently to meet any applicable treatment standards before shipment.