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Effective Period Rates of Duty Unit of Quantity Article Description Stat. Suf- fix Heading/ Subheading 2 1 Special General Cesium iodide (CAS No. 7789-17-5) (provided for in subheading 2827.60.51).............................................................. 1/ 9902.01.53 On or before 12/31/2020 No change No change Free 1/ Sodium sulfide (CAS No. 1313-82-2) (provided for in subheading 2830.10.00).............................................................. 1/ 9902.01.54 On or before 12/31/2020 No change No change Free 1/ Sodium Thiosulfate Pentahydrate (Sodium sulfurothioate hydrate (2:1.5)) (CAS No.10102-17-7) (provided for in subheading 2832.30.10).............................................................. 1/ 9902.01.55 On or before 12/31/2020 No change No change Free 1/ Barium dinitrate (CAS No. 10022-31-8) (provided for in subheading 2834.29.51).............................................................. 1/ 9902.01.56 On or before 12/31/2020 No change No change Free 1/ Sodium hypophosphite monohydrate (CAS No. 10039-56-2) (provided for in subheading 2835.10.00)................................... 1/ 9902.01.57 On or before 12/31/2020 No change No change Free 1/ Monopotassium phosphate (CAS No. 7778-77-0) (provided for in subheading 2835.24.00) ................................................... 1/ 9902.01.58 On or before 12/31/2020 No change No change 1.0% 1/ Ammonium polyphosphate (CAS No. 68333-79-9) (provided for in subheading 2835.39.50).................................................... 1/ 9902.01.59 On or before 12/31/2020 No change No change Free 1/ Cobalt carbonate (cobalt(2+) carbonate hydrate (1:1:1)) (CAS No. 513-79-1) (provided for in subheading 2836.99.10)......... 1/ 9902.01.60 On or before 12/31/2020 No change No change Free 1/ Zirconium basic carbonate (zirconium(4+) dicarbonate) (CAS No. 57219-64-4) (provided for in subheading 2836.99.50)...... 1/ 9902.01.61 On or before 12/31/2020 No change No change Free 1/ Potassium Ferricyanide (CAS No.13746-66-2) (provided for in subheading 2837.20.10).......................................................... 1/ 9902.01.62 On or before 12/31/2020 No change No change Free 1/ Sodium Ferrocyanide (CAS No. 13601-19-9) (provided for in subheading 2837.20.51).............................................................. 1/ 9902.01.63 On or before 12/31/2020 No change No change Free 1/ Potassium Ferrocyanide (CAS No.14459-95-1) (provided for in subheading 2837.20.51).......................................................... 1/ 9902.01.64 On or before 12/31/2020 No change No change Free 1/ Sodium oxosilanediolate hydrate (2:1:9) (Sodium metasilicate nonahydrate) (CAS No. 13517-24-3) (provided for in subheading 2839.11.00).............................................................. 1/ 9902.01.65 On or before 12/31/2020 No change No change Free 1/ Potassium Tetraborate (CAS No. 12045-78-2) (provided for in subheading 2840.20.00).......................................................... 1/ 9902.01.66 On or before 12/31/2020 No change No change Free 1/ Disodium dioxido(dioxo)tungsten (disodium wolframate) (CAS No. 13472-45-2) (provided for in subheading 2841.80.00)...... 1/ 9902.01.67 On or before 12/31/2020 No change No change Free 1/ Sodium thiocyanate (CAS No. 540-72-7) (provided for in subheading 2842.90.10).............................................................. 1/ 9902.01.68 On or before 12/31/2020 No change No change Free 1/ 1/ See chapter 99 statistical note 1. Rates of Duty 1 Harmonized Tariff Schedule of the United States Revision 15 (2026) Annotated for Statistical Reporting Purposes XXII 99 - II - 6 Note:The shaded areas indicate the provision has expired