; 1-propoxy-2-propanol (mixed isomers) (CAS No. 1569–01–3); siloxanes and silicones, dimethyl, 3-hydroxypropyl methyl, ethoxylated propoxylated (CAS No. 68937–55–3); 2-methyloxirane, oxirane, 3-prop-2-enoxyprop-1-ene (CAS No. 9041–33–2); urea, polymer with formaldehyde, methylated (CAS No. 68071–45–4); 2-propanol (CAS No. 67–63–0); 2-amino-2-methyl-1-propanol (CAS No. 124–68–5); 2-methyl-2-(methylamino)-1-propanol (CAS No. 27646–80–6); methanol (CAS No. 67–56–1) and water (CAS No. 7732–18–5) (provided for in subheading 3402.19.50) ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (149) Party popper Heading 9902.09.15 is amended— (A) by amending the article description to read as follows: Party poppers (Class 1.4G) (provided for in subheading 3604.90.00) ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (150) β-Cyfluthrin formulations Heading 9902.09.19 is amended— (A) by amending the article description to read as follows: Product mixtures containing (RS)-α-cyano-4-fluoro-3-phenoxybenzyl (1RS,3RS,1RS,3SR)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate (β-Cyfluthrin) (CAS No. 68359–37–5) (provided for in subheading 3808.91.25) ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (151) Imidacloprid and β-cyfluthrin formulations Heading 9902.09.21 is amended— (A) by amending the article description to read as follows: Product mixtures containing 1-(6-chloro-3-pyridinyl)methyl-N-nitroimidazolidin-2-ylideneamine (Imidacloprid) (CAS No. 138261–41–3) and (RS)-α-cyano-4-fluoro-3-phenoxybenzyl (1RS, 3RS;1RS, 3SR)- 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate (β-Cyfluthrin) (CAS No. 68359–37–5) (provided for in subheading 3808.91.25) ; and (B) by striking 12/31/2020 and inserting 12/31/2024 . (152) Acequinocyl Heading 9902.09.28 is amended— (A) by amending the article description to read as follows: Mixtures of 3-dodecyl-1,4-dioxo-1,4-dihydronaphthalen-2-yl acetate (CAS No. 57960–19–7) (Acequinocyl) and application adjuvants (provided for in subheading 3808.91.25)