Carbon black has historically been the subject of antidumping duty orders from the US Department of Commerce covering imports from specific countries. Importers should check the current scope of any active antidumping orders with the ITC or a licensed customs broker before sourcing, as covered merchandise requires cash deposit of estimated duties at entry.

Petroleum wax and paraffin wax are closely related but classified based on oil content, melting point, and degree of refinement under the HTS schedule. Fully refined paraffin with low oil content is classified differently from slack wax or microcrystalline wax. Suppliers should provide a product data sheet specifying oil content and melting point range to support accurate classification.