Unbleached kraft paper and paperboard, uncoated, in rolls of a width > 36 cm or in square or rectangular sheets with one side > 36 cm and the other side > 15 cm in the unfolded state, weighing < 150 g/m² (excl. kraft paper containing > 80% coniferous wood sulphate or soda pulp by weight of total fibre content; kraftliner and sack kraft paper; goods of heading 4802, 4803 or 4808)