5603.91.00 - Weighing not more than 25 g/m2

This HTS category, 5603.91.00, specifically covers nonwoven fabrics that are not impregnated, coated, covered, or laminated, and that weigh no more than 25 grams per square meter (g/m²). These are generally lightweight, pliable materials formed by bonding fibers or filaments together through mechanical entanglement, chemical adhesion, or thermal fusion. Their primary distinguishing characteristic is their minimal weight, indicating a very thin and often delicate construction.

Within the broader classification of "Other nonwovens," this subcategory is differentiated from its siblings solely by its weight. Categories 5603.92.00 and 5603.93.00 cover nonwovens weighing progressively more, while 5603.94 represents those exceeding 150 g/m². Therefore, the threshold of "not more than 25 g/m²" is the critical factor for classifying goods under 5603.91.00.

Further refinement within this weight category is provided by its subcategories. Code 5603.91.00.10 is for nonwovens that have been treated with materials other than or in addition to rubber, plastics, wood pulp, or glass fibers, including those specifically identified as "imitation suede." The residual category, 5603.91.00.90, encompasses all other nonwovens meeting the weight criteria but not falling under the specific treatments described in the preceding subcategory.