Superfund Tax on Chemical Substances; Request To Modify List of Taxable Substances; Notice of Filing for Methylene Diphenyl Diisocyanate; n=2.0-3.0

This notice of filing announces that a petition has been filed requesting that methylene diphenyl diisocyanate ((C 8 H 6 NO)(C 8 H 5 NO) n-2 (C 7 H 4 NO); n=2.0-3.0), also known as "MDI," 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.