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Effective Period Rates of Duty Unit of Quantity Article Description Stat. Suf- fix Heading/ Subheading 2 1 Special General Poly(isobutylene) hydroformylation products, reaction products with ammonia (CAS No. 337367-30-3) (provided for in subheading 3902.20.50).............................................................. 1/ 9902.10.66 On or before 12/31/2020 No change No change 5.0% 1/ Poly(2-methylpropene) (polyisobutylene), other than elastomeric (CAS No. 9003-27-4) (provided for in subheading 3902.20.50)................................................................................... 1/ 9902.10.67 On or before 12/31/2020 No change No change 5.1% 1/ Poly(propylene-co-ethylene) (CAS No. 9010-79-1) (provided for in subheading 3902.30.00).................................................... 1/ 9902.10.68 On or before 12/31/2020 No change No change 5.9% 1/ Silane, ethenyltrimethoxy-, reaction products with 1-butene-ethylene-propene polymer (CAS No. 832150-35-3) (provided for in subheading 3902.30.00) .................................. 1/ 9902.10.69 On or before 12/31/2020 No change No change Free 1/ Poly(propylene-co-1-butene-co-ethylene) (CAS No. 25895-47-0) (provided for in subheading 3902.30.00) ........... 1/ 9902.10.70 On or before 12/31/2020 No change No change Free 1/ C12-C18 alkenes, polymers with 4-methyl-1-pentene (CAS Nos. 25155-83-3, 81229-87-0 and 103908-22-1) (provided for in subheading 3902.90.00).................................................... 1/ 9902.10.71 On or before 12/31/2020 No change No change Free 1/ alpha-Alkenes (C20 -C24) maleic anhydride-4-amino-2,2,6,6-tetramethylpiperidine, polymer (CAS No. 152261-33-1) (provided for in subheading 3902.90.00)................................................................................... 1/ 9902.10.72 On or before 12/31/2020 No change No change Free 1/ Oligomeric poly(butadiene) (CAS No. 68441-52-1) (provided for in subheading 3902.90.00).................................................... 1/ 9902.10.73 On or before 12/31/2020 No change No change Free 1/ Poly(vinyl acetate-co-vinyl chloride) (CAS No. 9003-22-9) (provided for in subheading 3904.30.60) .................................. 1/ 9902.10.75 On or before 12/31/2020 No change No change Free 1/ Poly(fumaric acid-co-vinyl acetate-co-vinyl chloride) (CAS No. 32650-26-3) (provided for in subheading 3904.30.60) ........... 1/ 9902.10.76 On or before 12/31/2020 No change No change Free 1/ Poly(dibutyl (2Z)-2-butenedioate-co-vinyl chloride-co-2-hydroxypropyl acrylate) (CAS No. 114653-42-8) (provided for in subheading 3904.40.00) .................................. 1/ 9902.10.77 On or before 12/31/2020 No change No change Free 1/ Poly(vinyl chloride-co-hydroxypropyl acrylate) (CAS No. 53710-52-4) (provided for in subheading 3904.40.00) ........... 1/ 9902.10.78 On or before 12/31/2020 No change No change Free 1/ Poly(1,1,2,2-tetrafluoro-2-[(trifluoroethenyl)oxy]ethanesulfonyl fluoride-co-tetrafluoroethylene) (CAS No. 1163733-25-2) (provided for in subheading 3904.69.50) .................................. 1/ 9902.10.79 On or before 12/31/2020 No change No change Free 1/ Poly(1,1,2,2-tetrafluoro-2-[(trifluoroethenyl)oxy]ethanesulfonyl fluoride-co-tetrafluoroethylene) SO2F form (CAS No. 69462-70-0) (provided for in subheading 3904.69.50)............ 1/ 9902.10.80 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 - 83 Note:The shaded areas indicate the provision has expired