5007.90.30 - Containing 85 percent or more by weight of silk or silk waste

This classification covers woven fabrics where silk or silk waste comprises 85 percent or more of the total weight. These fabrics are distinct from those that do not meet this specific silk content threshold. The primary defining characteristic is the significant presence of silk, making it the dominant fiber in the textile construction.

Within the "Other fabrics" category (5007.90), this specific subheading differentiates itself from its sibling, 5007.90.60, which is also designated for "Other" woven fabrics but does not have the explicit 85% silk or silk waste content requirement. Therefore, the key differentiator is the precise quantitative composition of silk.

This subheading acts as a branch for further refinement of classification. Its subcategories, such as "Not jacquard woven" and a further "Other" designation (5007.90.30.90), allow for more granular classification based on the weave pattern or other distinguishing features of these high-silk content fabrics. This further breakdown ensures precise identification for duty and statistical purposes.