4802.20 - Paper and paperboard of a kind used as a base for photo-sensitive, heat-sensitive or electro-sensitive paper or paperboard:

Heading 4802.20 encompasses paper and paperboard specifically manufactured for use as a base in the production of photosensitive, heat-sensitive, or electro-sensitive materials. This includes a broad range of papers intended to receive or react to image-forming processes, such as those used in thermal printers, fax machines, or certain types of photographic paper. The defining characteristic of this category is its intended end-use in specialized imaging or recording applications, requiring specific surface properties or absorbency for optimal performance.

Distinguishing 4802.20 from its siblings, it is crucial to note that while other paper and paperboard under 4802 might be intended for writing, printing, or graphic purposes (4802.10, and the broader "Other" subheadings within 4802), this particular category is for base papers that are not inherently designed for direct visual communication but rather to be transformed into such by subsequent chemical or physical reactions. It is not wallpaper base (4802.40) nor is it general-purpose uncoated paper for writing or printing.

Within 4802.20, the subcategories further refine the classification based on the physical dimensions of the paper. 4802.20.10.00 specifically addresses paper and paperboard presented in larger formats, such as rolls exceeding 15 cm in width or rectangular sheets where both dimensions exceed 15 cm and 36 cm respectively. The "Other" subcategory captures materials that do not meet these specific dimensional criteria, allowing for a comprehensive classification of base papers for sensitive applications.