ADK Stab AO-259 Antioxidant from Canada
ADK Stab AO-259, chemically 1,6-Hexanediol bis(3,5-dibutyl-4-hydroxyphenyl)propionate, serves as a primary antioxidant in engineering plastics like nylon and polyester for long-term heat stability. It is specifically named in HTS 2918.29.06.00 under carboxylic acids with phenol function, as a chemically defined compound per Chapter 29 notes.
Duty Rate — Canada → United States
15.8%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Submit manufacturer's specification sheet verifying dibutyl-hydroxyphenyl structure to confirm HTS specificity
• Watch for anti-dusting agent additions (Chapter 29 note g); excess may reclassify as preparation
• Ensure drum packaging complies with UN hazmat if dust hazard present during import