(provided for in subheading 2805.30.00) Free No change No change On or before 12/31/2024 . 4117. Scandium crystal Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.19.17 Scandium crystals of 99.9 percent purity containing 3 ppm or less by weight of cobalt, 80 ppm or less by weight of chromium and 500 ppm or less by weight of iron (CAS No. 7440–20–2) (provided for in subheading 2805.30.00) Free No change No change On or before 12/31/2024 . 4118. Hexafluorotitanic acid Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.19.18 Dihydrogen hexafluorotitanate(2-) (CAS No. 17439–11–1) (provided for in subheading 2811.19.61) Free No change No change On or before 12/31/2024 . 4119. Silica gel cat litter with tray Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.19.19 Cat litter of synthetic silica gel, not crystalline, imported with a disposable cardboard tray coated with polyvinyl chloride (provided for in subheading 2811.22.10) Free No change No change On or before 12/31/2024 . 4120. Dioxosilane spherical particles (mean particle size 0.046–0.054 mm) Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.19.20 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, specific electrical resistance of 50,000 Ohm cm or more, and surface area 300 to 700 m²/g (provided for in subheading 2811.22.10) Free No change No change On or before 12/31/2024 . 4121. Silica gel cat litter Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.19.21 Cat litter formulated from synthetic silica gel, put up for retail sale (provided for in subheading 2811.22.10)