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Effective Period Rates of Duty Unit of Quantity Article Description Stat. Suf- fix Heading/ Subheading 2 1 Special General 2,2'-[(Phosphonomethyl)imino]diacetic acid hydrate (1:1) (CAS No. 5994-61-6) (provided for in subheading 2931.39.00) ...... 1/ 9902.05.29 On or before 12/31/2020 No change No change 2.5% 1/ Triphenyl phosphine (CAS No. 603-35-0) (provided for in subheading 2931.39.00).............................................................. 1/ 9902.05.30 On or before 12/31/2020 No change No change Free 1/ Bis[tris(2-methyl-2-phenylpropyl)tin]oxide (Fenbutatin oxide) (CAS No. 13356-08-6) (provided for in subheading 2931.90.26)................................................................................... 1/ 9902.05.31 On or before 12/31/2020 No change No change Free 1/ Triphenyltin hydroxide (CAS No. 76-87-9) (provided for in subheading 2931.90.26).............................................................. 1/ 9902.05.32 On or before 12/31/2020 No change No change Free 1/ (Triethoxysilyl)methyl anthracene-9-carboxylate (CAS No. 313482-99-4) (provided for in subheading 2931.90.30).......... 1/ 9902.05.33 On or before 12/31/2020 No change No change Free 1/ 4-Chloro-2-fluoro-3-methoxyphenylboronic acid (CAS No. 944129-07-1) (provided for in subheading 2931.90.30).......... 1/ 9902.05.34 On or before 12/31/2020 No change No change 4.6% 1/ Phenylphosphinic acid (CAS No. 1779-48-2) (provided for in subheading 2931.90.60).............................................................. 1/ 9902.05.35 On or before 12/31/2020 No change No change Free 1/ (4-Morpholinylmethylene)bis(phosphonic acid) (CAS No. 32545-75-8) (provided for in subheading 2931.90.60)............ 1/ 9902.05.36 On or before 12/31/2020 No change No change Free 1/ Ammonium (2RS)-2-amino-4-(methylphosphinato)butyric acid (Glufosinate Ammonium) (CAS No. 77182-82-2) (provided for in subheading 2931.39.00).......................................................... 1/ 9902.05.37 On or before 12/31/2020 No change No change 1.5% 1/ Sodium hydrogen methylarsonate (CAS No. 2163-80-6) (provided for in subheading 2931.90.90)................................... 1/ 9902.05.38 On or before 12/31/2020 No change No change Free 1/ Tetrakis(hydroxymethyl)phosphonium chloride (CAS No. 124-64-1) (provided for in subheading 2931.90.90)................ 1/ 9902.05.39 On or before 12/31/2020 No change No change Free 1/ Tetrakis(hydroxymethyl)phosphonium sulfate (CAS No. 55566-30-8) (provided for in subheading 2931.90.90)............ 1/ 9902.05.40 On or before 12/31/2020 No change No change Free 1/ N-(Phosphonomethyl)glycine (Glyphosate) (CAS No. 1071-83-6) (provided for in subheading 2931.90.90).............. 1/ 9902.05.41 On or before 12/31/2020 No change No change 3.1% 2/ 1/ Bis[(2,2-dimethyloctanoyl)oxy](dimethyl)stannane (CAS No. 68928-76-7) (provided for in subheading 2931.90.90)............ 1/ 9902.05.42 On or before 12/31/2020 No change No change Free 1/ (2-Chloroethyl)phosphonic acid (Ethephon) (CAS No.16672-87-0) (provided for in subheading 2931.90.90)...... 1/ 9902.05.43 On or before 12/31/2020 No change No change Free 1/ Dimethyl, methyl (polyethylene oxide acetate-capped) siloxane (CAS No. 70914-12-4) (provided for in subheading 2931.90.90)................................................................................... 1/ 9902.05.44 On or before 12/31/2020 No change No change Free 1/ 1/ See chapter 99 statistical note 1. 2/ Information received from U.S. Customs and Border Protection indicates that the product named in this heading may now be classified in subheading 2931.39.00, as a result of international tariff changes. Consult Customs officials concerning the use of this duty reduction provision. Rates of Duty 1 Harmonized Tariff Schedule of the United States Revision 15 (2026) Annotated for Statistical Reporting Purposes XXII 99 - II - 31 Note:The shaded areas indicate the provision has expired