4809.90.20.00 - Stereotype-matrix board and mat

This classification, HTS Code 4809.90.20.00, specifically covers "stereotype-matrix board and mat." These are specialized paperboard materials designed for use in the stereotype printing process. They are typically made from absorbent paper pulp, often impregnated with a binder to provide structural integrity and heat resistance. Their primary function is to serve as a mold or matrix into which molten metal is poured to create printing plates for offset lithography and other relief printing methods.

Within the broader category of "Carbon paper, self-copy paper and other copying or transfer papers," this subcategory is distinct from decalcomania paper, which is used for transferring decorative designs, and other general copying or transfer papers. While all fall under Chapter 48 and deal with papers for reproduction, stereotype-matrix board and mat are specifically for the creation of printing plates, not for direct image transfer to a final substrate or for use in duplicators or offset plates themselves.

As this is a leaf node within the HTS, there are no further subcategories. Therefore, the focus for classification under this code rests on confirming that the material in question is indeed intended and manufactured for use in the stereotype printing process, fitting the description of a "board and mat" designed for this specific industrial application.