heading 3910.00.00) Free No change No change On or before 12/31/2025 . 11621. Methyl silicone resins Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.25.54 Siloxanes and silicones, di-Me, polymers with Me silsesquioxanes, ethoxy-terminated (CAS No. 68554–66–5) (provided for in heading 3910.00.00) Free No change No change On or before 12/31/2025 . 11622. Epoxy functional polydimethylsiloxane Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.25.56 Methoxy-methyl-[3-[3-(oxiran-2-yl)propoxy]propyl]-trimethylsilyloxysilane (CAS No. 68440–71–1) (provided for in heading 3910.00.00) Free No change No change On or before 12/31/2025 . 11623. Polymethylhydrogensiloxane Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.25.57 Poly(methylhydrosiloxane) (CAS No. 63148–57–2) (provided for in heading 3910.00.00) Free No change No change On or before 12/31/2025 . 11624. Vinyl terminated siloxanes Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.25.58 Siloxanes and silicones, di-Me, vinyl group-terminated (ethenyl-[ethenyl(dimethyl)silyl]oxy-dimethylsilane) (CAS No. 68083–19–2) (provided for in heading 3910.00.00) Free No change No change On or before 12/31/2025 . 11625. Silicone hybrid resin (solvent free) Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.25.59 Mixtures containing 85 percent or more by weight of silsesquioxanes, Me Ph, methoxy-terminated, polymers with epichlorohydrin, 4,4′-(1-methylethylidene)bis[cyclohexanol] and trimethyl (CAS No. 349656–42–4) and 10 percent or less by weight cyclohexanol, 4,4′-(1-methylethylidene)bis-, polymer with 2-(chloromethyl)oxirane (CAS No. 30583–72–3) (provided for in heading 3910.00.00) Free No change No change On or before 12/31/2025 . 11626. Hydrogenated polycyclopentadiene resin Subchapter II of chapter