4804.31.10.00 - Weighing over 15 g/m² but not over 30 g/m²

This HTS classification covers specific types of unbleached condenser paper, a specialized kraft paper product. Condenser paper is characterized by its high degree of porosity and its intended use in the manufacturing of electrical capacitors. The defining physical characteristic for this subcategory is its weight, which must be over 15 g/m² but not exceed 30 g/m². This precise weight range is a critical factor in its suitability for capacitor applications.

This category is distinct from its sibling, 4804.31.20.00, which encompasses "Other" kraft paper and paperboard falling under the broader heading of unbleached, other kraft paper and paperboard weighing 150 g/m² or less, but not meeting the specific weight and functional criteria of condenser paper. The inclusion here specifically denotes paper engineered for electrical insulation purposes within capacitors.

As this is a leaf node, there are no further subcategories. Classification at this level is definitive, relying on the material (kraft paperboard), its unbleached state, its classification as condenser paper, and the precise weight range specified. Imports falling under this code must meet all these criteria to be correctly classified for customs purposes.