Superfund Tax on Chemical Substances; Request To Modify List of Taxable Substances; Notice of Filing for Regular Butyl Rubber (x = 7036, y = 88)

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This notice of filing announces that a petition has been filed requesting that regular butyl rubber ((C 4 H 8 ) x (C 5 H 8 ) y ; x = 7036, y = 88)) be added to the list of taxable substances. This notice of filing also requests comments on the petition. This notice of filing is not a determination that the list of taxable substances is modified.