This residual grouping includes glass wool and mineral wool insulation, glass fibers and rovings, glass beads, optical glass blanks, glass mirrors, and other technical or specialty glass articles that do not fit the flat glass, container, or standard glassware categories. Each product type has its own HTS classification and may carry distinct duty treatment.

Yes. Glass fiber products, including certain continuous glass fiber strands and rovings, have been subject to antidumping and countervailing duty investigations targeting specific countries. Importers should check the current scope of any active orders with the International Trade Administration before sourcing, as covered merchandise can trigger significant additional duties.