Free No change No change On or before 12/31/2020 . 428. PBA Solid (phenyl boronic acid) Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.05.34 4-Chloro-2-fluoro-3-methoxyphenylboronic acid (CAS No. 944129–07–1) (provided for in subheading 2931.90.30) 4.8% No change No change On or before 12/31/2020 . 429. Benzene phosphinic acid Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.02.35 Phenylphosphinic acid (CAS No. 1779–48–2) (provided for in subheading 2931.90.60) Free No change No change On or before 12/31/2020 . 430. Morpholinomethane diphosphonic acid Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.05.36 (4-Morpholinylmethylene)bis(phosphonic acid) (CAS No. 32545–75–8) (provided for in subheading 2931.90.60) Free No change No change On or before 12/31/2020 . 431. Glufosinate-ammonium Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.05.37 Ammonium (2RS)-2-amino-4-(methylphosphinato)butyric acid (Glufosinate Ammonium) (CAS No. 77182–82–2) (provided for in subheading 2931.39.00) 2.1% No change No change On or before 12/31/2020 . 432. MSMA Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.05.38 Sodium hydrogen methylarsonate (CAS No. 2163–80–6) (provided for in subheading 2931.90.90) Free No change No change On or before 12/31/2020 . 433. THPC Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.05.39 Tetrakis (hydroxymethyl)phosphonium chloride (CAS No. 124–64–1) (provided for in subheading 2931.90.90) Free No change No change On or before 12/31/2020 . 434. THPS Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.05.40 Tetrakis (hydroxymethyl)phosphonium sulfate (CAS No. 55566–30–8) (provided for in subheading 2931.90.90) 0.2%