; methyl(trioxido)silane in aqueous solution (CAS No. 31795–24–1) (provided for in subheading 2931.90.90) Free No change No change On or before 12/31/2024 . 4332. Octyltrimethoxysilane Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.21.37 Trimethoxy(2,4,4-trimethylpentyl)silane (CAS No. 34396–03–7) (provided for in subheading 2931.90.90) Free No change No change On or before 12/31/2024 . 4333. Octlytriethoxysilane Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.21.38 Triethoxy(2,4,4-trimethylpentyl)silane (CAS No. 35435–21–3) (provided for in subheading 2931.90.90) Free No change No change On or before 12/31/2024 . 4334. Methyltris(sec-butylamino)silane Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.21.40 N-[Bis(butan-2-ylamino)-methylsilyl]butan-2-amine (CAS No. 37697–65–7) (provided for in subheading 2931.90.90) Free No change No change On or before 12/31/2024 . 4335. Methyltris(methylethylketoximino)silane (MOS) Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.21.41 (E)-N-[Bis[[(E)-butan-2-ylideneamino]oxy]-methylsilyl]oxybutan-2-imine (CAS No. 22984–54–9) (provided for in subheading 2931.90.90) Free No change No change On or before 12/31/2024 . 4336. Heptamethyltrisiloxane Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.21.42 Methyl-bis(trimethylsilyloxy)silicon (CAS No. 1873–88–7) (provided for in subheading 2931.90.90) Free No change No change On or before 12/31/2024 . 4337. Tetramethyldisiloxane Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.21.43 1,1,3,3-Tetramethyldisiloxane (CAS No. 3277–26–7) (provided for in subheading 2931.90.90) 1.1% No change No change On or before 12/31/2024 . 4338. Dimethylchlorosilane Subchapter II of chapter 99 is amended by inserting