4811.51Subheading
Paper and paperboard; coated, impregnated or covered with plastics (excluding adhesives), bleached, weighing more than 150g/m2, other than goods of heading no. 4803, 4809, or 4810
Section X — Pulp of wood or of other fibrous cellulosic material; recovered (waste and scrap) paper or paperboard; paper and paperboard and articles thereof
This is a 6-digit subheading — the most specific level of the international HS. Country tariff schedules extend it further; the US tariff lines (HTS) below refine it to 8–10 digits for duty purposes.
US tariff lines for this subheading are not in the bundled starter dataset yet — the full HTS schedule is coming soon. You can still search by code in the tariff simulator.