Superfund Tax on Chemical Substances; Request to Modify List of Taxable Substances; Notice of Filing for Acrylonitrile-butadiene Rubber; x=3,344.33, y=1,335.09, a=2.98

This notice of filing announces that a petition has been filed requesting that acrylonitrile-butadiene rubber ((C<INF>4</INF>H<INF>6</INF>)<INF>x</INF>- (C<INF>3</INF>H<INF>3</INF>N)<INF>y</INF>- (C<INF>25</INF>H<INF>44</INF>OS<INF>2</INF>)<INF>a</INF>; x=3,344.33, y=1,335.09, a=2.98), also known as "NBR," 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.