4,4'-Diphenylbisphosphonous Acid Di(2',2",4',4"-di-tert-butyl)phenyl Ester from Japan
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.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
Import Tips
• 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