Irgafos 126 Stabilizer (4,4'-Diphenylbisphosphonous Acid Derivative)
Commercial-grade Irgafos 126, chemically 4,4'-diphenylbisphosphonous acid di(2',2",4',4"-di-tert-butyl)phenyl ester, used as a phosphite antioxidant in polypropylene and polyethylene resins. Falls under HTS 2931.90.10.00 as the specifically named aromatic organo-inorganic compound with phosphorus-carbon bonds.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If already mixed with other antioxidants forming compounded additive for rubber/plastics
Mixtures of antioxidants specifically for rubber/plastics treatment are classified in 3812, not as separate compounds.
If aliphatic rather than aromatic organo-inorganic structure
2931.90 distinguishes aromatic (10.00) vs other organo-inorganic compounds (90.00).
If reclassified by phosphorous acid function ignoring organo-inorganic nature
Halogenated/sulfonated phosphorous acid derivatives may shift to Chapter 29 subchapter II if Chapter notes prioritize acid function.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Submit commercial invoices specifying CAS number and matching the exact chemical name to prevent customs disputes over trade names
• Ensure packaging is industrial drums (>25kg) not retail; consumer packaging may trigger Chapter 38 reclassification
Related Products under HTS 2931.90.10.00
4,4'-Diphenylbisphosphonous Acid Di(2',2",4',4"-di-tert-butyl)phenyl Ester
This is a specific aromatic organo-inorganic compound containing phosphorus directly linked to carbon atoms, classified under HTS 2931.90.10.00 as a named product in the 'Other' category of organo-inorganic compounds. It is used primarily as a stabilizer and antioxidant in polymer processing and high-performance plastics.
Doverphos S-480 Phosphite Ester Antioxidant
Doverphos S-480 is the trade name for 4,4'-diphenylbisphosphonous acid di(2',2",4',4"-di-tert-butyl)phenyl ester, a high-performance secondary antioxidant for polyolefin processing. Classified specifically under HTS 2931.90.10.00 as the named aromatic organo-inorganic phosphorus compound per Chapter 29 hierarchy.
Phosphonous Acid Bis(2,4-di-tert-butylphenyl) Ester Derivative
Technical-grade phosphonous acid derivative matching 4,4'-diphenylbisphosphonous acid di(2',2",4',4"-di-tert-butyl)phenyl ester specification, used in nylon and engineering plastics stabilization. HTS 2931.90.10.00 covers this exact aromatic organo-inorganic structure with direct P-C bonds.