HTS code 4810.14.50.00 covers "Paper and paperboard, coated on one or both sides with kaolin (China clay) or other inorganic substances, with or without a binder, and with no other coating, whether or not surface-colored, surface-decorated or printed, in rolls or rectangular (including square) sheets, of any size › In sheets with one side not exceeding 435 mm and the other side not exceeding 297 mm in the unfolded state › Printed, embossed or perforated" under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.