; heptane (CAS No. 142–82–5) and methanedithione (CAS No. 75–15–0) (provided for in subheading 3824.99.92) Free No change No change On or before 12/31/2025 . 11539. Epoxy curing agents Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.70 Epoxy curing agent mixtures of linseed oil polymer with bisphenol A, bisphenol A diglycidyl ether, diethylenetriamine, formaldehyde, glycidyl phenyl ether and pentaethylenehexamine (CAS No. 68915–81–1) (provided for in subheading 3824.99.92) Free No change No change On or before 12/31/2025 . 11540. Aliphatic amine curing agents Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.71 [3-(Aminomethyl)phenyl]methanamine (CAS No. 1477–55–0) (provided for in subheading 3824.99.92) Free No change No change On or before 12/31/2025 . 11541. Non-halogenated flame retardants Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.72 Non-halogenated flame retardants based on organic phosphinates aluminum;diethylphosphinate (CAS No. 225789–38–8) phosphonic acid, aluminum salt (3:2) (CAS No. 56287–23–1) (provided for in subheading 3824.99.92) Free No change No change On or before 12/31/2025 . 11542. Ligaphob N 90 Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.73 Fatty acids, C16–18 and C18–unsaturated, sodium salts (CAS No. 68424–26–0) (provided for in subheading 3824.99.92) Free No change No change On or before 12/31/2025 . 11543. Organomodified siloxane Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.74 Mixtures of poly[oxy(methyl-1,2-ethanediyl)], α-butyl-ω-hydroxy- (CAS No. 9003–13–8); polysiloxanes, di-Me, hydroxy-terminated, ethoxylated propoxylated (CAS No. 64365–23–7)