2710.91.00.10 - Containing polychlorinated biphenyls (PCBs) at a concentration level of 50 mg/kg or more

This HTS category, 2710.91.00.10, specifically classifies waste oils that contain polychlorinated biphenyls (PCBs) at a concentration level of 50 milligrams per kilogram (mg/kg) or more. These are oils that have been used and are no longer suitable for their original purpose, and their hazardous nature is defined by the significant presence of PCBs. This classification is crucial for tracking and managing potentially hazardous materials during international trade.

The primary distinction of this subcategory from its sibling, 2710.91.00.50, lies in the specific contaminant and its concentration. While the sibling category covers waste oils containing polychlorinated terphenyls (PCTs) or polybrominated biphenyls (PBBs), or PCBs at concentrations *below* 50 mg/kg, this current category is exclusively for waste oils with PCBs at a concentration of 50 mg/kg or higher. This precise threshold for PCBs is the defining characteristic that separates these two classifications.

As this is a leaf node within the HTS classification system, there are no further subcategories for this specific code. Therefore, the classification ends with the identification of waste oils meeting the defined PCB concentration threshold. The practical implication is that goods falling under this code are subject to specific regulations and potentially higher duties or restrictions due to their hazardous PCB content.