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Section 6(h) of the Toxic Substances Control Act (TSCA) directs EPA to issue regulations under section 6(a) for certain persistent, bioaccumulative, and toxic chemical substances that were identified in the 2014 update of the TSCA Work Plan. EPA is selecting among the available prohibitions and other restrictions in TSCA section 6(a), in order to address risks of injury to health or the environment that the Administrator determines are presented by the chemical substances and reduce exposure to the chemical substances to the extent practicable. EPA intends to take final action on all of the chemicals that were addressed in the proposed rule that published on July 29, 2019 (i.e., the following persistent, bioaccumulative, and toxic chemicals identified pursuant to TSCA section 6(h): decabromodiphenyl ether; phenol, isopropylated phosphate (3:1), also known as tris(4-isopropylphenyl) phosphate; 2,4,6-tris(tert-butyl)phenol; pentachlorothiophenol; and hexachlorobutadiene). Although addressed in a single proposed rule, EPA intends to issue separate final rules. As such, the original Regulatory Agenda entry (RIN 2070-AK34) was split into five separate Regulatory Agenda entries. This particular entry is for 2,4,6-tris(tert-butyl)phenol (TTBP). 2,4,6-TTBP is an antioxidant that can be used as a fuel or lubricant additive, as an intermediate in the manufacture of other compounds, and as a waste fuel. EPA proposed to prohibit the distribution in commerce of 2,4,6-TTBP and products containing 2,4,6-TTBP in any container with a volume of less than 55 gallons for any use, in order to effectively prevent the use of 2,4,6-TTBP as a fuel additive or fuel injector cleaner by consumers and small commercial operations (e.g., automotive repair shops, marinas). This proposed restriction also would prohibit processing and distribution in commerce of 2,4,6-TTBP, and products containing 2,4,6-TTBP, for use as an oil or lubricant additive, regardless of container size. EPA also proposed to require affected persons to maintain, for three years from the date the record is generated, ordinary business records that demonstrate compliance with the restrictions, prohibitions, and other requirements. For information about the other chemical substances, see the Regulatory Agenda entries identified as RIN 2070-AK34 (decabromodiphenyl ether); RIN 2070-AK58 (tris(4-isopropylphenyl) phosphate. PIP (3:1)); RIN 2070-AK60 (pentachlorothiophenol); and RIN 2070-AK61(hexachlorobutadiene).