D-limonene and other terpene fractions recovered as by-products of essential oil processing may be classified under SITC 55135 when derived from essential oil production, but when imported primarily as industrial solvents or cleaning agents, they may fall under chemical headings instead. The intended end-use and the production process documentation both influence the correct classification; a customs broker should review the specific product specification and intended use.

FDA prior notice is required for food-use floral waters (e.g., rose water used as a food flavoring or ingredient). Floral waters imported solely for cosmetic or personal-care use are not subject to food prior notice, but they are regulated as cosmetic ingredients under the FD&C Act and must comply with cosmetic labeling and safety standards. Importers should clearly document the intended use to ensure the correct regulatory pathway is applied at entry.