Exudates such as shellac, copal, dammar, and mastic fall into this residual category when not classified under more specific headings — making precise botanical identification critical at entry. These materials serve as raw inputs for varnishes, adhesives, incense, and pharmaceutical excipients, so end-use documentation often accompanies customs declarations. Because many specimens are harvested from tropical forests, CITES permit requirements may apply to certain protected species, and importers should verify admissibility before shipment. Classification disputes frequently arise over whether a material qualifies as a gum, resin, or processed derivative, making consultation with a licensed customs broker advisable.

AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.