; the foregoing with a burst strength of 6205 kPa (900 psi) or higher per ASTM D3786 (provided for in subheading 7019.90.10) Free No change No change On or before 12/31/2024 . 5020. Silver catalyst Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.29.26 Silver exceeding 99.9 percent purity, in spherical shapes formed from silver anodes in an electrochemical process, such shapes with surface areas of 80 mm 3 or greater (CAS No. 7440–22–4) and ready for use as catalysts (provided for in subheading 7106.91.50) Free No change No change On or before 12/31/2024 . 5021. Silver round blanks Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.29.27 Silver round blanks (CAS No. 7440–22–4), semimanufactured and weighing not more than 1,000 grams (provided for in subheading 7106.92.50) Free No change No change On or before 12/31/2024 . 5022. Ferroboron alloy Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.29.28 Ferroboron alloys in powders, lumps, granules or chunks (provided for in subheading 7202.99.80) Free No change No change On or before 12/31/2024 . 5023. Cast iron nonmalleable threaded main body combo castings for residential fuel oil tanks Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.29.29 Main body combo castings of nonmalleable cast iron designed for residential fuel oil tanks (provided for in subheading 7307.11.00) Free No change No change On or before 12/31/2024 . 5024. Cast iron nonmalleable threaded vent caps for residential fuel oil tanks Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.29.30 Threaded vent caps of nonmalleable cast iron designed for residential fuel oil tanks (provided for in subheading 7307.11.00) Free No change No change On or before 12/31/2024 . 5025. Cast iron nonmalleable threaded bushings for residential