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 99 is amended by inserting in numerical sequence the following new heading: 9902.25.60 Hydrogenated polycyclopentadiene resin (1,3-Cyclopentadiene homopolymer, hydrogenated) (CAS No. 68132–00–3) (provided for in subheading 3911.10.00) Free No change No change On or before 12/31/2025 . 11627. Water dispersable HDI based polyisocyanate Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.25.61 Hexane,1,6-diisocyanato-, homopolymer (CAS No. 28182–81–2) and cyclohexane,5-isocyanato-1-(isocyanatomethyl)-1,3,3-trimethyl-,homopolymer (CAS No. 53880–05–0) (provided for in subheading 3911.90.25) Free No change No change On or before 12/31/2025 . 11628. Cyanate ester resins for high-end electronic, aerospace, and industrial applications Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.25.62 Cyanic acid, C,C′-[(1-methylethylidene)di-4,1-phenylene] ester, homopolymer (CAS No. 25722–66–1) (provided for in subheading 3911.90.45) Free No change No change On or before 12/31/2025 . 11629. Polyethyleneimine, component used in manufacturing medical devices Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.25.63 Polyethylenimine (CAS No. 9002–98–6), of a kind used as a component for further manufacturing into a finished medical device (provided for in subheading 3911.90.90) Free No change No change On or before 12/31/2025 . 11630. Polyhexanide Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.25.64 Poly (hexamethylenebiguanide) hydrochloride (Polyhexanide) (CAS No. 32289–58–0) (provided for in subheading 3911.90.90) Free No change No change On or before 12/31/2025 .