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Effective Period Rates of Duty Unit of Quantity Article Description Stat. Suf- fix Heading/ Subheading 2 1 Special General Mixtures of approximately 20 percent or less diphosphoric acid, polymers with ethoxylated reduced methyl esters of reduced polymerized oxidized tetrafluoroethylene (CAS No. 200013-65-6) and less than 10 percent 2-(2-methoxypropoxy)-1-propanol (CAS No. 34590-94-8), remaining content is water (provided for in subheading 3907.20.00)................................................................................... 1/ 9902.11.14 On or before 12/31/2020 No change No change 0.3% 1/ Heat-curable epoxy resin mixture containing more than 30 percent by weight of 4,4'-(9H-fluorene-9,9-diyl)bis(2-chloroaniline) (CAS No. 107934-68-9) as a curing agent (provided for in subheading 3907.30.00)................................................................................... 1/ 9902.11.15 On or before 12/31/2020 No change No change Free 1/ Mixtures of ethanaminium, 2-hydroxy-N-(2-hydroxyethyl)-N,N-dimethyl-, methyl sulfate (1:1), polymer with 2-(chloromethyl)oxirane, 1,3-diisocyanatomethylbenzene, a-hydro-w-hydroxypoly[oxy(methyl-1,2-ethanediyl)] and 1,2,3-propanetriol (CAS No. 82294-81-3); Phenol, 4,4'-(1-methylethylidene)bis-, polymer with 2-(chloromethyl)oxirane (CAS No. 25068-38-6); and Formamide, N,N-dimethyl-(CAS No. 68-12-2) (provided for in subheading 3907.30.00) ............................................................. 1/ 9902.11.16 On or before 12/31/2020 No change No change Free 1/ 1,2-Bis-O-(2-oxiranylmethyl)-D-glucitol (CAS No. 68412-01-1) (provided for in subheading 3907.30.00)................................... 1/ 9902.11.17 On or before 12/31/2020 No change No change Free 1/ Sulfonated polyethylene terephthalate (CAS No. 63534-56-5) (provided for in subheading 3907.60.00)................................... 1/ 9902.11.18 On or before 12/31/2020 No change No change Free 2/ 1/ Poly(dimethyl carbonate-co-1,6-hexanediol) (CAS No. 101325-00-2) (provided for in subheading 3907.99.50).......... 1/ 9902.11.19 On or before 12/31/2020 No change No change Free 1/ Dimethyl carbonate polymer with 1,6-hexanediol copolymer and 2-oxepanone (CAS No. 282534-15-0) (provided for in subheading 3907.99.50).............................................................. 1/ 9902.11.20 On or before 12/31/2020 No change No change Free 1/ Poly[(dimethyl butanedioate-co-1-(2-hydroxyethyl)-2,2,6,6-tetramethylpiperidin-4-ol)] (CAS No. 65447-77-0) (provided for in subheading 3907.99.50)................................................................................... 1/ 9902.11.21 On or before 12/31/2020 No change No change Free 1/ Polymer of 1,4-benzenedicarboxylic acid with 1,4-butanediol and hexanedioic acid (CAS No. 60961-73-1) (provided for in subheading 3907.99.50) ............................................................. 1/ 9902.11.23 On or before 12/31/2020 No change No change 1.6% 1/ 1,4-Benzenedicarboxylic acid, polymer with 1,4 butanediol and decanedioc acid (CAS No. 28205-74-5) (provided for in subheading 3907.99.50) ............................................................. 1/ 9902.11.24 On or before 12/31/2020 No change No change Free 1/ 1/ See chapter 99 statistical note 1. 2/ Subheading 3907.60.00 was deleted from the tariff schedule; the product named in the heading may be classifiable in subheading 3907.61.00 or 3907.69.00. Consult U.S. Customs and Border Protection relating to the use of this duty suspension provision. Rates of Duty 1 Harmonized Tariff Schedule of the United States Revision 15 (2026) Annotated for Statistical Reporting Purposes XXII 99 - II - 87 Note:The shaded areas indicate the provision has expired