An official website of the United States government.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Assessing and Managing Chemicals under TSCA

Risk Evaluation 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.

On this page:


Problem Formulation for HBCD Cluster Risk Evaluation under Amended TSCA

This problem formulation refines the scope of the HBCD cluster risk evaluation by clarifying the chemical uses that EPA expects to evaluate and describing how EPA expects to conduct the evaluation. This is an important interim step prior to completing and publishing the final risk evaluation. The problem formulation document will be available for comment until August 16, 2018 in the docket listed above.

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). 

After releasing the scope documents, the dockets for each of the first 10 chemicals were open for public comments. Read EPA’s Responses to Public Comments Received on the Scope Documents for the First Ten Chemicals for Risk Evaluation under TSCA. This document addresses cross-cutting public comments received in response to EPA publishing 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.