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Effective Period Rates of Duty Unit of Quantity Article Description Stat. Suf- fix Heading/ Subheading 2 1 Special General 4-tert-Butylphenol; formaldehyde; 4-[2-(4-hydroxyphenyl)propyl]phenol (CAS No. 54579-44-1) (provided for in subheading 3909.40.00)................................... 1/ 9902.11.36 On or before 12/31/2020 No change No change Free 1/ Mixture of polymers of formaldehyde-1,3-benzenediol (1:1) (CAS No. 24969-11-7) and unreacted 1,3-Benzenediol (CAS No. 108-46-3) (provided for in subheading 3909.40.00)......... 1/ 9902.11.37 On or before 12/31/2020 No change No change Free 1/ 2-Oxepanone polymer with 1,4-butanediol and 5- isocyanato-1-(isocyanatomethyl)-1,3,3- trimethylcyclohexane, 2-ethyl-1-hexanol-blocked (CAS No. 189020-69-7) (provided for in subheading 3909.50.50) ................................................... 1/ 9902.11.38 On or before 12/31/2020 No change No change Free 1/ Hexanedioic acid, dihydrazide, polymer with 5-amino-1,3,3-trimethylcyclohexanemethanamine, 1,3-butanediol and 1,1'-methylenebis[4-isocyanatocyclohexane], methyl ethyl ketone oxime- and polyethylene glycol mono-methyl ether-blocked in aqueous solution (CAS No. 200295-51-8) (provided for in subheading 3909.50.50) .................................. 1/ 9902.11.39 On or before 12/31/2020 No change No change Free 1/ Oxirane, 2-methyl-, polymer with oxirane, ether with 1,2,3-propanetriol (3:1), polymer with 2,4-diisocyanato-1-methylbenzene and α-hydro-ω-hydroxypoly[oxy(methyl-1,2-ethanediyl)] ether with 2-ethyl-2-(hydroxymethyl)-1,3-propanediol (3:1), caprolactam-blocked (CAS No. 936346-53-1) (provided for in subheading 3909.50.50) ............................................................. 1/ 9902.11.40 On or before 12/31/2020 No change No change Free 1/ 1,3 Benzenedicarboxylic acid, polymer with 2-ethyl-2-(hydroxymethyl)-1,3-propanediol, hexanedioic acid, 1,6-hexanediol, 1,3-isobenzofurandione and 1,1'-methylenebis[4-isocyanatobenzene], di-ethyl malonate-blocked (CAS No. 200414-59-1) (provided for in subheading 3909.50.50).............................................................. 1/ 9902.11.41 On or before 12/31/2020 No change No change Free 1/ Poly[oxy(methyl-1,2-ethanediyl)],α-hydro-ω-hydroxy- and 5- isocyanato-1-(isocyanatomethyl)-1,3,3- trimethylcyclohexane (Isophorone diisocyanate) (CAS No. 1012318-97-6) (provided for in 3909.50.50).......................................................................... 1/ 9902.11.42 On or before 12/31/2020 No change No change Free 1/ 1,4:5,8-Dimethanonaphthalene, 2-ethylidene-1,2,3,4,4a,5,8,8a-octahydro-, polymer with 3a,4,7,7a-tetrahydro-4,7-methano-1H-indene, hydrogenated (CAS No. 881025-72-5), presented in pellet form (provided for in subheading 3911.90.25).................................................... 1/ 9902.11.43 On or before 12/31/2020 No change No change Free 1/ Polyethylenimine (CAS No. 9002-98-6), refrigerated, in containers not holding over 1 L (provided for in subheading 3911.90.25)................................................................................... 1/ 9902.11.44 On or before 12/31/2020 No change No change Free 1/ Polyethylenimine (CAS No. 9002-98-6), of a kind used as a component for further manufacturing into a finished medical device (provided for in subheading 3911.90.25) ..................... 1/ 9902.11.45 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 - 89 Note:The shaded areas indicate the provision has expired