On or before 12/31/2024 . 4290. Guanidine sulfamate Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.20.94 Guanidine sulfamic acid (CAS No. 50979–18–5) (provided for in subheading 2925.29.90) Free No change No change On or before 12/31/2024 . 4291. Liquid, blocked cycloaliphatic diamine used as crosslinker for polyisocyanate resins Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.20.95 2-Methyl-N-[[1,3,3-trimethyl-5-(2-methylpropylideneamino)cyclohexyl]methyl]propan-1-imine (CAS No. 54914–37–3) (provided for in subheading 2925.29.90) Free No change No change On or before 12/31/2024 . 4292. 3,4-Difluorobenzonitrile Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.20.96 3,4-Difluorobenzonitrile (CAS No. 64248–62–0) (provided for in subheading 2926.90.43) Free No change No change On or before 12/31/2024 . 4293. 2-Amino-5-cyano-N,3-dimethylbenzamide Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.20.97 2-Amino-5-cyano-N,3-dimethylbenzamide (CAS No. 890707–29–6) (provided for in subheading 2926.90.43) 4.5% No change No change On or before 12/31/2024 . 4294. TFMPA Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.20.98 2-[3-(Trifluoromethyl)phenyl]acetonitrile (CAS No. 2338–76–3) (provided for in subheading 2926.90.48) Free No change No change On or before 12/31/2024 . 4295. Dimethyl 2,2′-azobisisobutyrate Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.20.99 Methyl 2-[(1-methoxy-2-methyl-1-oxopropan-2-yl)diazenyl]-2-methylpropanoate (CAS No. 2589–57–3) (provided for in subheading 2927.00.40) Free No change No change On or before 12/31/2024 . 4296. Antioxidant/metal deactivator Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: