HTS code 4807.00.91.00 covers "Composite paper and paperboard (made by sticking flat layers of paper or paperboard together with an adhesive), not surface-coated or impregnated, whether or not internally reinforced, in rolls or sheets › Paper and paperboard, laminated internally with bitumen, tar or asphalt › Straw paper and paperboard, whether or not covered with paper other than straw paper" 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.