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Effective Period Rates of Duty Unit of Quantity Article Description Stat. Suf- fix Heading/ Subheading 2 1 Special General 1,3-Propanediamine, N,N” -1,2-ethanediylbis-, polymer with 2,4,6-trichloro-1,3,5-triazine,reaction products with N-butyl-2,2,6,6-tetramethyl-4-piperidinamine (CAS No. 136504-96-6) (provided for in subheading 3812.39.60).......... 1/ 9902.10.33 On or before 12/31/2020 No change No change Free 1/ Preparations containing tetrakis[2,4-bis(2-methyl-2-propanyl)phenyl] 4,4'-biphenyldiylbis(phosphonite) (CAS No. 119345-01-6) (provided for in subheading 3812.39.60)................................... 1/ 9902.10.34 On or before 12/31/2020 No change No change Free 1/ 4-Methylphenol - tricyclo[5.2.2.02,6]undecane (1:1) (CAS No. 68610-51-5) (provided for in subheading 3812.39.60)............ 1/ 9902.10.35 On or before 12/31/2020 No change No change Free 1/ 1,6-Hexanediamine,N1,N6-bis(2,2,6,6-tetramethyl-4-piperidinyl)-, polymer with 2,4,6-trichloro-1,3,5-triazine, reaction products with 3-bromo-1-propene,N-butyl-1-butanamine and N-butyl-2,2,6,6-tetramethyl-4-piperidinamine, oxidized, hydrogenated (CAS No. 247243-62-5) (provided for in subheading 3812.39.90).............................................................. 1/ 9902.10.36 On or before 12/31/2020 No change No change Free 1/ Magnesium aluminum hydroxide carbonate (synthetic hydrotalcite) (CAS No. 11097-59-9) (provided for in subheading 2842.90.90); and magnesium aluminum hydroxide carbonate (synthetic hydrotalcite) (CAS No. 11097-59-9) coated with stearic acid (CAS No. 57-11-4) (provided for in subheading 3812.39.90) ............................................................. 1/ 9902.10.37 On or before 12/31/2020 No change No change Free 1/ Potassium methylate solution (CAS No. 865-33-8) (provided for in subheading 3815.90.50).................................................... 1/ 9902.10.38 On or before 12/31/2020 No change No change Free 1/ Mixtures of polyethylene glycol (CAS No. 25322-68-3), (acetate) pentammine cobalt dinitrate (CAS No. 14854-63-8), and zinc carbonate (CAS No. 3486-35-9) (provided for in subheading 3815.90.50).............................................................. 1/ 9902.10.39 On or before 12/31/2020 No change No change Free 1/ Mixture of precipitated silica gel (CAS No. 112926-00-8) and (4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyl)oxidanyl (CAS No. 2226-96-2) of a kind used as polymerization inhibitors (provided for in subheading 3815.90.50)................................... 1/ 9902.10.40 On or before 12/31/2020 No change No change Free 1/ Mixtures of (acetato) pentammine cobalt dinitrate (CAS No. 14854-63-8) with a polymeric or paraffinic carrier (provided for in subheading 3815.90.50).................................................... 1/ 9902.10.41 On or before 12/31/2020 No change No change Free 1/ Branched chain C24 mixed alkylbenzenes (CAS No. 68081-77-6) (provided for in subheading 3817.00.15)............ 1/ 9902.10.42 On or before 12/31/2020 No change No change 1.3% 1/ α-Hydro-ω-hydroxypoly(oxy-1,2-ethanediyl)borate (CAS No. 71243-41-9) (provided for in subheading 3819.00.00)............ 1/ 9902.10.43 On or before 12/31/2020 No change No change Free 1/ Monocarboxylic fatty acids derived from palm oil (provided for in subheading 3823.19.20).......................................................... 1/ 9902.10.44 On or before 12/31/2020 No change No change 1.4% 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 - 80 Note:The shaded areas indicate the provision has expired