Polarizing sheets sourced from China may be subject to Section 301 tariffs, while those from Japan or South Korea are not. Because the product is physically similar regardless of origin, CBP scrutinizes country-of-origin declarations carefully, particularly for films processed in third countries using Chinese-origin base materials. Importers should maintain robust supply-chain documentation to substantiate origin claims.

Polarizing material cut to shape for use as a component in a specific article (such as a lens or display panel) may be classifiable under a more specific heading depending on its degree of processing and the article it is destined for. However, flat sheets and plates in their uncut or simply cut rectangular form are generally classified under 9001200000. A binding ruling from CBP is recommended when the material is further processed before importation.