The key classification distinction is the botanical source of the sugar: 170310 is reserved for cane-derived molasses, while 170390 captures all other molasses, including beet. Importers should obtain a certificate of origin or mill documentation confirming the raw material (sugar beet vs. sugarcane) to support the correct heading. Analytical testing for betaine content can serve as corroborating evidence, since beet molasses contains significantly higher betaine levels than cane molasses.

Animal feed compounding and industrial fermentation — particularly yeast manufacturing and bioethanol production — are the dominant end uses for beet molasses imports. A smaller volume enters specialty food channels as a flavoring ingredient. The intended end use can affect classification between the commercial and quota-subject lines within 170390, so importers should document the downstream application at the time of entry.