7410.21.30 - Copper clad laminates

This HTS category, 7410.21.30, specifically classifies copper clad laminates that are not otherwise specified. These laminates consist of a base material coated with copper foil, where the thickness of the copper foil itself, excluding any backing material, does not exceed 0.15 mm. The "Copper foil" parent category establishes the fundamental characteristic of a thin copper layer, and this subcategory focuses on these backed laminates of refined copper.

The primary distinction for this HTS code lies in its "Other" nature at this level, as indicated by the sibling category 7410.21.60. While 7410.21.60 covers other types of backed copper foil laminates, 7410.21.30 encompasses those that meet the refined copper criteria and are backed, but do not fit into more specific subcategories if they existed. The "Backed" designation is crucial, differentiating these products from unbacked copper foil.

Within this classification, further subdivisions exist to refine the classification based on the specific composition of the base material. The existence of subcategories like those "Having a base wholly of plastics impregnated glass" and "Other" (7410.21.30.60) indicates that while the copper foil is of refined copper and it is backed, the nature of the backing material is the next key differentiator for precise tariff application.