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Effective Period Rates of Duty Unit of Quantity Article Description Stat. Suf- fix Heading/ Subheading 2 1 Special General Ion-exchange resin comprised of divinylbenzene co-polymerized with styrene and ethylstyrene (CAS No. 9052-95-3) in spherical beads with a mean particle size between 0.30 and 1.20 mm (provided for in subheading 3914.00.60) .................................................................................. 1/ 9902.11.66 On or before 12/31/2020 No change No change 1.4% 1/ Ion-exchange resin comprised of a copolymer of methacrylic acid cross-linked with divinylbenzene, in the hydrogen ionic form (CAS No. 50602-21-6) (provided for in subheading 3914.00.60)................................................................................... 1/ 9902.11.67 On or before 12/31/2020 No change No change Free 1/ Ion-exchange resin utilizing a type I quaternary ammonium functional group consisting of benzene (chloromethyl)ethenyl- , polymer with diethenylbenzene, compound with N,N- diethylethanamine (CAS No. 63453-90-7) in spherical beads with a mean particle size between 0.30 and 1.20 mm (provided for in subheading 3914.00.60) ................................................... 1/ 9902.11.68 On or before 12/31/2020 No change No change Free 1/ Ion-exchange resin, free base form, utilizing a tertiary amine functional group consisting of 2-propenamide, N-[3- (dimethylamino)propyl]-, polymer with diethenylbenzene and 1,1'-[oxybis(2,1-ethanediyloxy)]bis[ethene] (CAS No. 65899-87-8) in spherical beads with a mean particle size between 0.30 and 1.20 mm (provided for in subheading 3914.00.60)................................................................................... 1/ 9902.11.69 On or before 12/31/2020 No change No change Free 1/ Ion-exchange resin, chloride form, utilizing a quarternary ammonium functional group, consisting of 1,2-bis(ethenyl)benzene; 4-[(E)-2-[(E)-2-but-3-enoxyethenoxy]ethenoxy]but-1-ene; trimethyl-[3-(prop-2-enoylamino)propyl]azanium; chloride (CAS No. 65997-24-2) in spherical beads with a mean particle size between 0.30 and 1.20 mm (provided for in subheading 3914.00.60)................................................................................... 1/ 9902.11.70 On or before 12/31/2020 No change No change Free 1/ Ion-exchange resin comprising sodium salts of sulfonated poly(divinylbenzene-co-ethylstyrene-co-styrene) (CAS No. 69011-22-9) (provided for in subheading 3914.00.60)............ 1/ 9902.11.71 On or before 12/31/2020 No change No change Free 1/ Anion ion-exchange resin, hydroxide form, chloromethylated, and 2-(dimethylamino)ethanol-quaternized hydroxide of poly(divinylbenzene-co-styrene-co-ethylstyrene) (CAS No. 69011-16-1) in spherical beads with a mean particle size between 0.30 and 1.20 mm (provided for in subheading 3914.00.60) .................................................................................. 1/ 9902.11.72 On or before 12/31/2020 No change No change Free 1/ Chloromethylated, trimethylamine-quaternized poly(divinylbenzene-co-styrene-co-ethylstyrene) (CAS No. 69011-19-4) (provided for in subheading 3914.00.60)............ 1/ 9902.11.73 On or before 12/31/2020 No change No change Free 1/ Poly(divinylbenzene-co-acrylic acid) (CAS No. 9052-45-3) (provided for in subheading 3914.00.60) .................................. 1/ 9902.11.74 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 - 92 Note:The shaded areas indicate the provision has expired