4810.29.70.20 - Containing by weight 25 percent or more cotton fiber

This HTS classification covers paper and paperboard, coated on one or both sides with kaolin (China clay) or other inorganic substances, with or without a binder, and with no other coating. These papers are specifically intended for writing, printing, or other graphic purposes, and crucially, more than 10 percent by weight of their total fiber content must consist of fibers obtained by a mechanical or chemi-mechanical process. The sub-classification, "Containing by weight 25 percent or more cotton fiber," further refines this category by requiring a significant proportion of cotton fiber within the material composition.

Distinguishing this category from its siblings lies in the specific combination of coating, intended use, fiber content derived from mechanical processes, and the presence of a substantial amount of cotton fiber. While other categories within the broader "Paper and paperboard" chapter may share some of these characteristics, this particular node is defined by the confluence of these precise criteria. The "Other" designations at higher levels indicate that these papers do not fall into more specific, previously defined sub-classifications based on color, decoration, printing, or specific mechanical fiber percentages, instead being grouped based on this material composition detail.

As this is a leaf node, there are no further subcategories to introduce. Therefore, classification under HTS Code 4810.29.70.20 is definitive once the preceding criteria are met. Examples of products that would fall here include high-quality printing paper for premium publications or specialized artistic papers where the inclusion of cotton fiber contributes to specific textural or archival properties, provided the mechanical fiber content and coating requirements are satisfied.