4802.57 - Other, weighing 40 g/m² or more but not more than 150 g/m²:

This HTS category, 4802.57, encompasses uncoated paper and paperboard that is specifically *not* in rolls and meets precise weight specifications. To fall within this classification, the material must weigh 40 g/m² or more but not exceed 150 g/m². Furthermore, the paper or paperboard must be in rectangular or square sheets, and critically, it does not contain fibers obtained by a mechanical or chemi-mechanical process, or if it does, these fibers constitute no more than 10 percent by weight of the total fiber content. This excludes papers primarily made using mechanical pulping methods.

This category is distinguished from its siblings by its sheet form and specific weight range. Unlike 4802.55 and 4802.56, which also cover papers within the 40-150 g/m² weight range, 4802.57 is not restricted to rolls or specific sheet dimensions. It differs from 4802.54 by its higher minimum weight (40 g/m²) and from 4802.58 by its upper weight limit of 150 g/m². The core differentiating factor for 4802.57 is that it applies to sheets of paper and paperboard within this specific grammage, exclusive of those that are perforated or primarily produced from mechanical pulp.

The subcategories within 4802.57 provide further detail on the intended use or specific types of paper falling under this broad classification. These include distinct classifications for writing and cover paper, drawing paper, and specialized India and bible paper. The "Other" subcategory captures any remaining papers that meet the general criteria but do not fit into these more specific end-use descriptions. This granular breakdown allows for more precise classification based on the paper's intended application and unique characteristics.