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2026-06-26 · Notice · Federal Register document 2026-12868

Superfund Tax on Chemical Substances; Notice of Determinations To Add Substances to List of Taxable Substances

Official abstract: This notice of determinations modifies the list of taxable substances to include the following two substances: chloro-isobutene- isoprene rubber ((C<INF>4</INF>H<INF>8</INF>)<INF>n</INF>- (C<INF>5</INF>H<INF>7.31</INF>Cl<INF>0.69</INF>)<INF>m</INF>; n=97.75, m=2.25) and ethylene-propylene-dicyclopentadiene rubber ((C<INF>2</INF>H<INF>4</INF>)<INF>m</INF>- (C<INF>3</INF>H<INF>6</INF>)<INF>n</INF>- (C<INF>10</INF>H<INF>12</INF>)<INF>o</INF>; m=73.18, n=26.53, o=0.29).