; and (B) by striking 12/31/2020 and inserting 12/31/2025 . (193) Terpolymer used in sensors Heading 9902.10.84 is amended— (A) by amending the article description to read as follows: Poly(1,1-difluoroethene-co-1-chloro-1,2,2-trifluoroethene-co -1,1,2-trifluoroethene) (CAS No. 81197–12–8) (provided for in subheading 3904.69.50) ; and (B) by striking 12/31/2020 and inserting 12/31/2025 . (194) Certain mixture for use in greases Heading 9902.10.87 is amended— (A) by amending the article description to read as follows: Mixture of poly(1-[difluoro(trifluoromethoxy)methoxy]-1,1,2,2-tetrafluoro -2-(trifluoromethoxy)ethane) (CAS No. 69991–61–3) and Perfluoropolymethylisopropyl ether (CAS No. 69991–67–9) (provided for in subheading 3904.69.50) ; and (B) by striking 12/31/2020 and inserting 12/31/2025 . (195) Additive for rust prevention Heading 9902.10.90 is amended— (A) by amending the article description to read as follows: 1-Propene, 1,1,2,3,3,3-Hexafluoro-, oxidized, polymerized, reduced, hydrolized reaction products with ammonia (CAS No. 370097–12–4) (provided for in subheading 3904.69.50) ; and (B) by striking 12/31/2020 and inserting 12/31/2025 . (196) Mold release agent Heading 9902.10.95 is amended— (A) by amending the article description to read as follows: Ethene, tetrafluoro, oxidized, polymerized, reduced, methyl esters, reduced, ethoxylated (CAS No. 162492–15–1) (provided for in subheading 3904.69.50) ; and (B) by striking 12/31/2020 and inserting 12/31/2025 . (197) Polyvinyl formal resin Heading 9902.11.02 is amended— (A) by amending the article description to read as follows: Polyvinyl formal resin (ethenol; [(ethenyloxy)methoxy]ethene (CAS Nos. 63450–15–7, 63148–64–1, and 9003–33–2) (provided for in subheading 3905.91.10)