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Effective Period Rates of Duty Unit of Quantity Article Description Stat. Suf- fix Heading/ Subheading 2 1 Special General Dioxosilane (Silicon dioxide amorphous) (CAS No. 7631-86-9) entirely spherical micro-spheres of mean particle size of between 0.007 and 0.020 mm, uniform particle size with a uniformity coefficient of 1.65 or less, trace metal impurities less than 70 ppm, specific electrical resistance of 50,000 Ohm cm (provided for in subheading 2811.22.10)................................... 1/ 9902.01.27 On or before 12/31/2020 No change No change Free 1/ Dioxosilane (Silicon dioxide amorphous) (CAS No. 7631-86-9) presented in the form of entirely spherical micro-spheres, certified by the importer as having a mean particle size of between 0.046 and 0.054 mm, uniform particle size with a uniformity coefficient of 1.65 or less and specific electrical resistance of 50,000 Ohm cm or more (provided for in subheading 2811.22.10).............................................................. 1/ 9902.01.28 On or before 12/31/2020 No change No change Free 1/ Silicon dioxide amorphous, certified by the importer as comprising entirely spherical micro-spheres with mean particle size of 28 to 45 micrometers (µm) and surface area 600 to 800 m²/g (CAS No. 7631-86-9) (provided for in subheading 2811.22.10) .................................................................................. 1/ 9902.01.29 On or before 12/31/2020 No change No change Free 1/ Amorphous silicon dioxide micro-spheres of mean particle size of 0.050-0.100 mm, and specific electrical resistance of 50,000 Ohm cm or more (CAS No. 7631-86-9) (provided for in subheading 2811.22.10).............................................................. 1/ 9902.01.30 On or before 12/31/2020 No change No change Free 1/ Amorphous silicon dioxide micro-spheres of mean particle size 0.003-0.018 mm, linseed oil absorption 30-40 ml/g, surface area less than 80 m²/g, and pore volume less than 0.1 ml/g (CAS No. 7631-86-9) (provided for in subheading 2811.22.10) ........................................................................................................ 1/ 9902.01.31 On or before 12/31/2020 No change No change Free 1/ Entirely spherical silicon dioxide micro-spheres, certified by the importer as having mean particle size of 3 to 18 micrometers (µm), linseed oil absorption 150 to 400 ml/g, microbial count less than 100 cfu/g, mold count less than 100 cfu/g, heavy metals less than 20 ppm, surface area 300 to 800 m²/g and pore volume of 0.8 to 2.5 ml/g (CAS No. 7631-86-9) (provided for in subheading 2811.22.10)................................... 1/ 9902.01.32 On or before 12/31/2020 No change No change Free 1/ Thionyl chloride (CAS No. 7719-09-7) (provided for in subheading 2812.17.00).............................................................. 1/ 9902.01.33 On or before 12/31/2020 No change No change Free 1/ Chromium(III) oxide (CAS No. 1308-38-9) (provided for in subheading 2819.90.00).............................................................. 1/ 9902.01.34 On or before 12/31/2020 No change No change Free 1/ Iron(III) oxide (Pigment red 101) (CAS No. 1309-37-1) (provided for in subheading 2821.10.00) .................................. 1/ 9902.01.35 On or before 12/31/2020 No change No change 2.1% 1/ Hydroxylamine (CAS No. 7803-49-8) (provided for in subheading 2825.10.00).............................................................. 1/ 9902.01.36 On or before 12/31/2020 No change No change 2.7% 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 - 4 Note:The shaded areas indicate the provision has expired