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Effective Period Rates of Duty Unit of Quantity Article Description Stat. Suf- fix Heading/ Subheading 2 1 Special General Poly(divinylbenzene-co-ethylstyrene) (CAS No. 9043-77-0) (provided for in subheading 3911.90.90) .................................. 1/ 9902.11.56 On or before 12/31/2020 No change No change Free 1/ Industrial grade nitrocellulose, having a nitrogen content of less than 12.4 percent on a dry weight basis, damped with an alcohol content of 28 to 32 percent by weight (CAS No. 9004-70-0), presented in fiber drums each containing 85 kg, 100 kg, 110 kg or 120 kg of such nitrocellulose, certified by the importer as made from at least 50 percent cotton linter or wood pulp and as having each such drum lined with an antistatic plastic bag and equipped with a coupling for mechanical unloading (provided for in subheading 3912.20.00)................................................................................... 1/ 9902.11.57 On or before 12/31/2020 No change No change Free 1/ Industrial grade nitrocellulose, having a nitrogen content of less than 12.4 percent on a dry weight basis, damped with an alcohol content of 33 to 37 percent by weight (CAS No. 9004-70-0), presented in fiber drums each containing 85 kg, 100 kg, 110 kg or 120 kg of such nitrocellulose, the foregoing certified by the importer as made from at least 80 percent cotton linters, wood pulp and ethanol, with such fiber drums each lined with an antistatic plastic bag and equipped with a coupling for mechanical unloading (provided for in subheading 3912.20.00)................................................................................... 1/ 9902.11.58 On or before 12/31/2020 No change No change Free 1/ Sodium alginate (CAS No. 9005-38-3) (provided for in subheading 3913.10.00).............................................................. 1/ 9902.11.59 On or before 12/31/2020 No change No change Free 1/ Propylene glycol alginates (CAS No. 9005-37-2) (provided for in subheading 3913.10.00).......................................................... 1/ 9902.11.60 On or before 12/31/2020 No change No change Free 1/ Alginic acid (CAS No. 9005-32-7), ammonium alginate (CAS No. 9005-34-9), potassium alginate (CAS No. 9005-36-1), calcium alginate (CAS No. 9005-35-0) and magnesium alginate (CAS No. 37251-44-8) (provided for in subheading 3913.10.00) ........................................................................................................ 1/ 9902.11.61 On or before 12/31/2020 No change No change Free 1/ Sodium alginate (CAS No. 9005-38-3) containing citrate (provided for in subheading 3913.10.00)................................... 1/ 9902.11.62 On or before 12/31/2020 No change No change Free 1/ Sodium hyaluronate (CAS No. 9067-32-7) (provided for in subheading 3913.90.20) ............................................................. 1/ 9902.11.63 On or before 12/31/2020 No change No change 4.3% 1/ Ion-exchange resin, copolymerized from acrylonitrile with divinylbenzene, ethylvinylbenzene and 1,7-octadiene, hydrolyzed (CAS No. 130353-60-5) (provided for in subheading 3914.00.60)................................................................................... 1/ 9902.11.64 On or before 12/31/2020 No change No change Free 1/ Ion-exchange resin consisting of poly(acrylic acid-co-2,2'-oxydiethanol-co-ethenoxyethene), acid form (CAS No. 359785-58-3) (provided for in subheading 3914.00.60).... 1/ 9902.11.65 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 - 91 Note:The shaded areas indicate the provision has expired