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Effective Period Rates of Duty Unit of Quantity Article Description Stat. Suf- fix Heading/ Subheading 2 1 Special General 1,4-Benzenedicarboxylic acid, polymer with 1,4-butanediol, hexanedioic acid and nonanedioic acid (CAS No. 83064-08-8) (provided for in subheading 3907.99.50)................................... 1/ 9902.11.26 On or before 12/31/2020 No change No change Free 1/ 1,4-Benzenedicarboxylic acid, polymer with 1,4-butanediol, decanedioic acid and hexanedioic acid (CAS No.109586-86-9) (provided for in subheading 3907.99.50) .................................. 1/ 9902.11.27 On or before 12/31/2020 No change No change Free 1/ 1,2-Benzenedicarboxylic acid, 3,4,5,6-tetrabromo-, polymer with 2-ethyl-2-(hydroxymethyl)-1,3-propanediol, hexanedioic acid, 2,2-((1-methylethylidene)bis(4,1-phenyleneoxymethylene)) bis(oxirane) and 1,2-propanediol in toluene (CAS No. 68568-64-9) (provided for in subheading 3907.99.50)............ 1/ 9902.11.28 On or before 12/31/2020 No change No change Free 1/ Poly(1,4-benzenedicarboxylic acid-co-1,4-butanediol-co-nonanedioic acid) (CAS No. 26590-80-7) (provided for in subheading 3907.99.50)............ 1/ 9902.11.29 On or before 12/31/2020 No change No change Free 1/ Dodecanedioic acid, polymer with 4,4ʹ-methylenebis(2- methylcyclohexanamine) (CAS No. 163800-66-6) (provided for in subheading 3908.10.00).................................................... 1/ 9902.11.30 On or before 12/31/2020 No change No change Free 1/ Micro-porous, ultrafine, spherical polyamide powders of polyamide 6 (CAS No. 356040-79-4), polyamide-12 (CAS No. 338462-62-7) and polyamide 6, 12 (CAS No. 356040-89-6) (provided for in subheading 3908.10.00 or 3908.90.70).......... 1/ 9902.11.31 On or before 12/31/2020 No change No change Free 1/ Poly{(azacyclotridecan-2-one)-co-(1,3-benzenedicarboxylic acid; 1,4-benzenedicarboxylic acid)-alt-(1,6-hexanediamine; 4,4'-methylenebis[cyclohexanamine]; 4,4'-methylenebis[2-methylcyclohexanamine])} (CAS No. 1030611-14-3) (provided for in subheading 3908.90.70)........ 1/ 9902.11.32 On or before 12/31/2020 No change No change Free 1/ Poly{(azacyclotridecan-2-one)-co-(1,3-benzenedicarboxylic acid; 1,4-benzenedicarboxylic acid)-alt-(4,4'-methylenebis[2-methylcyclohexanamine])} (CAS No. 62694-40-0) (provided for in subheading 3908.90.70)...... 1/ 9902.11.33 On or before 12/31/2020 No change No change Free 1/ Mixtures containing 40 to 60 percent by weight formaldehyde polymers with aniline (CAS No. 25214-70-4) and 60 to 40 percent by weight 4,4'-methylendianiline (CAS No. 101-77-9) (provided for in subheading 3909.39.00)................................... 1/ 9902.11.34 On or before 12/31/2020 No change No change Free 1/ Poly(phenol-co-formaldehyde-co-4-(1,1-dimethylethyl)phenol) (CAS No. 28453-20-5) (provided for in subheading 3909.40.00)................................................................................... 1/ 9902.11.35 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 - 88 Note:The shaded areas indicate the provision has expired