EPA is withdrawing two significant new use rules (SNURs) promulgated under section 5(a)(2) of the Toxic Substances Control Act (TSCA) for chemical substances which were the subject of premanufacture notices (PMNs), i.e., rutile, tin zinc, calcium-doped (PMN P-06-36; CAS No. 389623-01-2) and rutile, tin zinc, sodium-doped (PMN P-06-37; CAS No. 389623-07-8). These chemical substances are subject to TSCA section 5(e) consent orders issued by EPA. EPA received a notice of intent to submit adverse comments on the direct final rule. Therefore, the Agency is withdrawing these SNURs, as required under the expedited SNUR rulemaking process. EPA intends to publish in the near future proposed SNURs for these two chemical substances under separate notice and comment procedures.