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Effective Period Rates of Duty Unit of Quantity Article Description Stat. Suf- fix Heading/ Subheading 2 1 Special General Iminidiacetic acid ion-exchange resin (sodium 2,2'-[(4-vinylbenzyl)imino]diacetate - 1,4-divinylbenzene (2:1:1) (CAS no. 70660-50-3) in spherical beads with a mean particle size between 0.425 and 1.20 mm (provided for in subheading 3914.00.60) .................................................................................. 1/ 9902.11.75 On or before 12/31/2020 No change No change Free 1/ Ion-exchange resin and chelating resin, with a isothiouronium functional group, iminodiacetic acid ion-exchange resin (CAS No. 109945-55-3) in spherical beads with a mean particle size between 0.30 and 1.20 mm (provided for in subheading 3914.00.60) .................................................................................. 1/ 9902.11.76 On or before 12/31/2020 No change No change Free 1/ Ion-exchange resin and chelating resin with an aminophosphoric functional group, polystyrene resin with aminophosphonic acid groups (CAS No. 125935-42-4) in spherical beads with a mean particle size between 0.30 and 1.20 mm (provided for in subheading 3914.00.60) .................. 1/ 9902.11.77 On or before 12/31/2020 No change No change Free 1/ Potassium methacrylate-divinylbenzene copolymer (Polacrilin potassium) (CAS No. 65405-55-2) (provided for in subheading 3914.00.60) .................................................................................. 1/ 9902.11.78 On or before 12/31/2020 No change No change Free 1/ Strips wholly of expanded poly(tetrafluoroethylene) (PTFE) (CAS No. 9002-84-0), noncellular, with adhesive backing, of a thickness greater than 3 mm but not over 30 mm, presented rolled in spools, certified by the importer as having a tensile strength of 24.1 MPa (3,500 psi) or higher per American Society for Testing and Materials (ASTM) F-152 (provided for in subheading 3916.90.50) ......................................................... 1/ 9902.11.79 On or before 12/31/2020 No change No change Free 1/ Insulated tubes of plastics, not reinforced, without fittings, presented in the form of hose, the foregoing tubes having polyethylene pipes inserted therein and suitable for use in hot water supply or heating systems (provided for in subheading 3917.32.00)................................................................................... 1/ 9902.11.80 On or before 12/31/2020 No change No change Free 1/ Polyethylene micro-tubes, having an interior diameter of 0.01 mm and wall thickness of 0.05 mm (provided for in subheading 3917.32.00) .................................................................................. 1/ 9902.11.81 On or before 12/31/2020 No change No change Free 1/ Plastic elbows, holding pins, bend supports, anchor clips, staples of a kind used in construction applications (provided for in subheading 3917.40.00).................................................... 1/ 9902.11.82 On or before 12/31/2020 No change No change 5.1% 1/ Transparent polypropylene coextruded flat film in rolls with a thickness between 162-198µm and a width between 396-398 mm (provided for in subheading 3920.20.00)........................... 1/ 9902.11.83 On or before 12/31/2020 No change No change Free 1/ Sheets of plastics of poly(methyl methacrylate), noncellular and not reinforced, laminated, supported or similarly combined with other materials, not flexible, the foregoing of a kind used to produce counter tops or edging, cabinet tops, faces or edges for home or office furnishings (provided for in subheading 3920.51.50)................................................................................... 1/ 9902.11.84 On or before 12/31/2020 No change No change 3.5% 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 - 93 Note:The shaded areas indicate the provision has expired