Acrylonitrile content — typically ranging from roughly 18% to 50% — directly determines the latex's oil resistance, flexibility at low temperatures, and suitability for specific end products such as gloves or seals. While HTS classification does not subdivide by acrylonitrile level, buyers and customs brokers should include the grade specification on commercial invoices and purchase orders to support quality control, end-use verification, and any downstream product certification requirements.

NBR latex is an industrial chemical intermediate and does not trigger mandatory FSIS, FDA, or APHIS admissibility review. Standard CBP entry procedures apply, though importers should ensure compliance with EPA TSCA inventory requirements for chemical substances and verify that the product's CAS number is listed or exempt.