4804.51.00.00 - Unbleached

This HTS category, 4804.51.00.00, specifically covers unbleached kraft paper and paperboard that weighs 225 grams per square meter or more, and is not otherwise classified under headings 4802 or 4803. The defining characteristic here is the "unbleached" state, meaning the paper has not undergone chemical or mechanical bleaching processes to alter its natural brown color derived from the wood pulp. These are typically produced in rolls or sheets and are intended for various industrial and packaging applications where strength and durability are paramount.

Distinguishing this category from its siblings is crucial for accurate classification. The sibling category 4804.52.00.00 applies to kraft paper and paperboard that is bleached uniformly throughout the mass and where over 95 percent of the fiber content consists of wood fibers obtained by a chemical process. In contrast, 4804.51.00.00 is exclusively for the unbleached variety. The other sibling, 4804.59.00.00, is a residual category for "other" kraft paper and paperboard weighing 225 g/m² or more that do not meet the specific criteria of the other subheadings within this group.

As this is a leaf node, there are no further subcategories to introduce. Therefore, classification within 4804.51.00.00 depends on confirming the material is kraft paper or paperboard, that it is unbleached, and that its basis weight meets or exceeds 225 g/m². Examples of products that would fall here include unbleached kraft linerboard used in corrugated boxes, unbleached kraft paper for industrial bags, and certain types of unbleached specialty papers with the specified weight and composition.