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This proposed rulemaking will address the unreasonable risk of injury to health presented by Cyclic Aliphatic Bromide Cluster (HBCD), under its conditions of use as documented in EPA’s 2020 Risk Evaluation and 2022 revised risk determination. Section 6(a) of the Toxic Substances Control Act (TSCA) requires EPA to address by rule any unreasonable risk identified in a TSCA section 6(b) risk evaluation by applying requirements to the extent necessary so the chemical no longer presents unreasonable risk. EPA's 2020 risk evaluation for HBCD, describing the conditions of use and presenting EPA's determinations of unreasonable risk, is in docket EPA-HQ-OPPT-2019-0237, with the 2022 revised risk determination and additional materials in docket EPA-HQ-OPPT-2016-0735.