Assessing and Managing Chemicals under TSCA

Risk Evaulation for Cyclic Aliphatic Bromide Cluster (HBCD Cluster)

The hexabromocyclodecanes (HBCD cluster) in the cyclic aliphatic bromide cluster consists of the following chemicals: Hexabromocyclododecane; 1,2,5,6,9,10-Hexabromocyclododecane; and 1,2,5,6-Tetrabromocyclooctane. Two of these chemicals are used as flame retardants, no uses for 1,2,5,6‑tetrabromocyclooctane have been identified. The primary use of the two chemicals is in expanded polystyrene foam (EPS) and extruded polystyrene foam (XPS) in the building and construction industry for thermal insulation boards and laminates for sheathing products. They are also used in plastics (additive) and textiles (back-coating). In the United States, the HBCD cluster was historically used as a flame retardant in the back coating of textiles; however, research and information gathering indicates that the HBCD cluster is no longer used in consumer textile applications outside of the automotive industry.

Learn about what EPA has done to manage risks on the HBCD cluster.

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Scope of HBCD Cluster Risk Evaluation under Amended TSCA

This scope document includes the hazards, exposures, conditions of use, and the potentially exposed or susceptible subpopulations EPA expects to consider in its risk evaluation of the HBCD cluster conducted pursuant to TSCA Section 6(b)(4). EPA will publish and take public comment on a Problem Formulation document for the HBCD cluster which will refine the current scope, as an additional interim step, prior to publication the draft risk evaluation. This problem formulation is expected to be released within approximately six months of publication of the scope documents.

Review of the HBCD Cluster Prior to the Lautenberg Act

Prior to the Lautenberg Act, EPA began the review of the HBCD cluster and published the following information.