; 2,2,6,6-tetramethylpiperidin-4-yl) octadecanoate (CAS No. 167078–06–0) and 2,2,6,6-tetramethylpiperidin-4-ol (CAS No. 2403–88–5) (provided for in subheading 3812.39.90) Free No change No change On or before 12/31/2024 . 4636. Preparations of bis(2,4–dichlorobenzoyl) peroxide 50 percent paste Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.48 Preparations each used as an initiator (radical source) in the crosslinking of polymers consisting of bis(2,4-dichlorobenzoyl)peroxide (CAS No. 133–14–2) and silicone oil (provided for in subheading 3815.90.50) Free No change No change On or before 12/31/2024 . 4637. Distilled tall oils Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.49 Distilled tall oils containing more than 2 percent by weight rosin (CAS No. 8002–26–4) (provided for in subheading 3823.13.00) Free No change No change On or before 12/31/2024 . 4638. Pyridine, alkyl derivatives Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.50 Pyridine, alkyl derivatives (CAS No. 68391–11–7) (provided for in subheading 3824.99.28) Free No change No change On or before 12/31/2024 . 4639. Polyisocyanate crosslinking agents Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.51 Polyisocyanate crosslinking agent tris(4-isocyanatophenoxy)-sulfanylidene-λ5-phosphane (CAS No. 4151–51–3) (provided for in subheading 3824.99.28) Free No change No change On or before 12/31/2024 . 4640. Bonding agent mixtures Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.24.52 Mixture of phenol;propane-1-sulfonic acid (CAS No. 70775–94–9) and 1,3-diisocyanato-2-methylbenzene