4802.58 - Weighing more than 150 g/m²:

This HTS classification, 4802.58, pertains to uncoated paper and paperboard, specifically designed for writing, printing, or other graphic applications. Crucially, this subcategory encompasses materials weighing more than 150 grams per square meter (g/m²). These are often characterized by their substantial weight and caliper, suggesting applications where durability and thickness are primary requirements. The paper or paperboard must not contain a significant proportion of fibers derived from mechanical or chemi-mechanical processes, with no more than 10 percent by weight being of such origin.

Distinguishing 4802.58 from its sibling categories is primarily based on the grammage (weight per unit area). While 4802.54 covers very lightweight papers below 40 g/m², and 4802.55, 4802.56, and 4802.57 address materials weighing between 40 and 150 g/m², this category is reserved for the heavier grades exceeding 150 g/m². The distinction in weight is a critical determinant for many commercial and industrial uses of paper and paperboard.

Within this category, further subdivisions exist to account for specific formats. The first subcategory addresses paper and paperboard presented in strips or rolls exceeding 15 cm in width, or in rectangular (including square) sheets where both dimensions exceed 36 cm and 15 cm respectively in their unfolded state. The second subcategory, "Other," encompasses materials that do not meet these specific dimensional criteria, allowing for classification of heavier uncoated papers and paperboards in various other presentations.