This final rule, issued pursuant to section 8(a) of the Toxic Substances Control Act (TSCA), will require certain manufacturers (including importers) of 3 chemical substances in the chemical category "Pyridinamines" and 20 chemical substances in the chemical category "Tungsten Compounds" to submit a one-time report on general production/importation volume, end use, and exposure-related information to EPA. The Interagency Testing Committee (ITC), established under section 4(e) of TSCA to recommend chemicals and chemical mixtures to EPA for priority testing consideration, amends the TSCA Section 4(e) Priority Testing List through periodic reports submitted to EPA. The ITC recently added these 2 categories containing 23 chemicals to the Priority Testing List. In addition, EPA is adding as required under the Paperwork Reduction Act (PRA) the Office of Management and Budget (OMB) approved information collection requirements contained in this final rule to EPA's table of OMB control numbers in the Code of Federal Regulations (CFR).