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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing cadmium compounds or prepared for electroplating baths
Organo-inorganic compounds with specific metal content or end-use preparations fall under different 2931.90 subheadings.
If imported as mixture or solution exceeding 30% concentration with other additives
Chemical preparations or mixtures not qualifying as separate chemically defined compounds per Chapter 29 notes are classified in Chapter 38.
If classified primarily by alcohol function rather than organo-inorganic phosphorus
Chapter notes prioritize classification by the heading last in numerical order; alcohol-phenols may take precedence over organo-inorganic if phosphorus not defining feature.
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Import Tips & Compliance
• Provide detailed chemical analysis (NMR, IR spectra) confirming the exact structure matches the named compound in 2931.90.10.00 to avoid reclassification
• Include Safety Data Sheets (SDS) and end-use statements showing industrial chemical applications, not retail packaging
• Verify purity levels (>98%) as impurities may affect classification; common pitfall is mislabeling as general phosphite ester under broader codes
Related Products under HTS 2931.90.10.00
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.
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.