9405.91 - Of glass:

This HTS category, 9405.91, specifically encompasses parts for lamps and lighting fittings that are manufactured from glass. This includes a wide array of components such as glass shades, globes, diffusers, and decorative glass elements designed to be incorporated into luminaires. The defining characteristic for classification within this code is the material composition: the part must be primarily made of glass to be eligible.

Distinguishing 9405.91 from its sibling categories is crucial for accurate classification. The sibling category 9405.92.00.00 covers similar parts made from plastics, whereas 9405.99.00.00 is a residual category for parts made of materials other than glass or plastic. Therefore, the key differentiator lies in the primary material of the lighting part itself.

Within 9405.91, further subdivisions exist to refine the classification of glass parts. The subcategories include "Globes and shades," which directly refers to these common glass components, and specific entries like "Chimneys" (9405.91.40.00) for glass components traditionally used in certain types of lamps. The broader "Other" subcategory (9405.91.60) captures any remaining glass parts that do not fit into the more specific designations, ensuring comprehensive coverage for all glass lighting components not elsewhere specified.