in subheading 3911.90.25) Free No change No change On or before 12/31/2020 . 1029. Polyethyleneimine, components for manufacturing into medical devices Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.11.45 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 3911.90.25) Free No change No change On or before 12/31/2020 . 1030. Aliphatic/aromatic polyisocyanate copolymer Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.11.46 1,6-diisocyanatohexane