At a glance
| What this is | A brominated flame retardant used in expanded/extruded polystyrene building insulation and as a back-coating on upholstery and other textiles |
| CAS number | 25637-99-4 (also 3194-55-6) |
| Carcinogen status | Not classified as a carcinogen. The concern is persistence/bioaccumulation and endocrine + developmental-neuro toxicity |
| Key hazard | A persistent organic pollutant (POP); endocrine disruptor; US EPA rates its developmental health effect as "high hazard" |
| Where you encounter it | The textile back-coating of upholstered furniture and some furnishings, building insulation, and the house dust they shed into |
| Sleep micro-environment relevance | Found to be the most abundant flame retardant in bedroom dust in one study, with bedding identified as a crucial source |
| Regulation | Stockholm Convention Annex A (elimination, 2013); EU REACH authorisation — a phased-out but persistent legacy |
Regulatory & certification status
Where hbcd stands across the major regulatory systems and the certifications a bedroom product might carry. Each row links to the governing instrument; where a jurisdiction has no specific measure, that is stated plainly rather than left blank.
| European Union | HBCD (EC 247-148-4, CAS 25637-99-4) is a REACH Substance of Very High Concern, identified on PBT (persistent/bioaccumulative/toxic) grounds under Annex XIII and added to the SVHC Candidate List on 28 October 2008, then placed on the Authorisation List (Annex XIV) by Commission Regulation (EU) No 143/2011 (listed 18 February 2011), with a sunset date of 21 August 2015 after which use requires an ECHA-granted authorisation; no CLP Annex VI harmonised classification could be confirmed for HBCD. It is separately listed under the EU POPs Regulation (EU) 2019/1021 Annex I, where Commission Delegated Regulation (EU) 2024/2555 — in force 17 October 2024 — tightened the unintentional-trace-contaminant limit from 100 mg/kg to 75 mg/kg, retaining 100 mg/kg for recycled polystyrene used in EPS/XPS building or civil-engineering insulation (an exemption the Commission was due to review by 1 January 2026). Regulatory — EUR-Lex |
| United States | HBCD (as the "Cyclic Aliphatic Bromide Cluster") was among the first chemicals evaluated under amended TSCA; EPA's final risk evaluation (September 2020) and final revised risk determination (June 2022) found unreasonable risk to the environment (6 of 12 conditions of use) and to workers from inhalation exposure in building/construction materials use, but a TSCA Section 6 risk-management rule remains pending/not yet finalized. HBCD does not currently appear on California's OEHHA Proposition 65 list of chemicals known to cause cancer or reproductive toxicity. Regulatory — US EPA |
| Canada | HBCD is FINAL-listed on CEPA Schedule 1 (List of Toxic Substances) via a Final Order made in November 2012. As of 30 June 2026 its implementing instrument is the Prohibition of Certain Toxic Substances Regulations, 2025 (SOR/2025-270) — published in the Canada Gazette, Part II on 31 December 2025 and taking effect six months later — which repeals the Prohibition of Certain Toxic Substances Regulations, 2012 (as amended 2016) that previously governed HBCD. The 2025 Regulations prohibit manufacturing, using, selling and importing HBCD and, more broadly than the predecessor rule (which reached only HBCD itself and EPS/XPS foam containing it), products containing HBCD generally, subject to: an incidental-presence threshold of 100 mg/kg (0.01% w/w) below which the prohibition does not apply; continued use, sale and import of land-based motor-vehicle replacement parts (and vehicles built with them) containing HBCD until 31 December 2031; a carve-out for stock already in Canadian inventory when the Regulations came into force; and a renewable permit pathway (maximum three years) where no feasible alternative exists. Regulatory — Government of Canada · Canada Gazette |
| Australia | Under Australia's Industrial Chemicals Environmental Management Standard (IChEMS, administered by DCCEEW — distinct from AICIS's premarket introduction scheme), HBCDD is scheduled to Schedule 7 ("industrial chemicals likely to cause serious or irreversible environmental harm, no essential use"); import, export and manufacture have been prohibited since 1 July 2024, subject to a narrow unintentional-trace exemption (≤100 mg/kg, under review by the department by 1 July 2027). Regulatory — DCCEEW |
| United Kingdom | HBCD was carried over from EU REACH into UK REACH as retained/assimilated law at the end of the Brexit transition period (31 December 2020) and remains on both the UK REACH Candidate List (SVHC) and the UK REACH Authorisation List (Annex 14), inheriting the same PBT rationale and 21 August 2015 sunset date as the pre-Brexit EU listing; HSE is the competent authority. Regulatory — UK legislation · HSE |
| International | Listed in Annex A (elimination) of the Stockholm Convention on Persistent Organic Pollutants by decision SC-6/13 (adopted May 2013), which entered into force 26 November 2014; a time-limited specific exemption for production and use in EPS/XPS building insulation ran the default five years from entry into force and lapsed 26 November 2019, with no extension identified. No IARC monograph or cancer classification for HBCD was identified (not present in IARC's cumulative list of classified agents). Regulatory — Stockholm Convention |
| Certifications | CertiPUR-US: explicitly prohibited — "Hexabromocyclododecane or HBCD" (CAS 3194-55-6) is a named line item in the Prohibited Flame Retardant Additives table within Section 5 (Prohibited Substances) of its Technical Guidelines, though HBCD is rarely relevant to flexible polyurethane foam (CertiPUR-US's actual scope) since it is used almost exclusively in rigid EPS/XPS polystyrene foam. OEKO-TEX Standard 100: HBCDD and all three main diastereomers (alpha/beta/gamma, by CAS number) are explicitly named among the restricted substances in the Standard's Annex 6/Appendix 7 expanded ("Detox") criteria catalogue — applied only when specifically requested by the applicant, not automatically on every Standard 100 certificate. GREENGUARD/GREENGUARD Gold: a chamber-based low-VOC emissions certification (UL 2818 / CDPH v1.2 protocol) designed around volatile organic compounds; it publishes no HBCD-specific limit or named-substance ban, and as a high-molecular-weight, low-volatility additive HBCD is not the kind of analyte its VOC sampling method targets. Industry — CertiPUR-US · OEKO-TEX |
| The 72-hour test window | Largely missed. HBCD is a high-molecular-weight flame retardant physically blended into polymer rather than chemically bound (an "additive," not a "reactive," flame retardant), so it partitions into house dust and surface films rather than off-gassing as a volatile organic compound. Exposure and biomonitoring literature link human HBCD body burden primarily to dust ingestion (and diet) rather than inhalation, meaning a short chamber VOC-emissions test is not designed to reliably capture it. Inferred — from the compound's volatility/emission profile versus the VOC focus of short chamber tests |
What it is
Hexabromocyclododecane (HBCD) is a brominated cyclic flame retardant with two principal uses: expanded and extruded polystyrene (EPS/XPS) building insulation, and the back-coating applied to upholstery and other textiles to slow ignition. That textile use is the one that belongs in a bedroom guide — it places a brominated flame retardant in the fabric layer of furniture and furnishings. Peer-reviewed — Feiteiro et al. 2021
HBCD's defining property is persistence. It is a recognised persistent organic pollutant: persistent, bioaccumulative, toxic and capable of long-range transport — which is why it was added to the Stockholm Convention's elimination list in 2013. Regulatory — Stockholm Convention, HBCD Annex A (2013) Unlike an additive that fades, a POP lingers in products, dust and bodies for a long time.
How it relates to the bedroom
The route: out of treated textiles, into bedroom dust
Like the other brominated flame retardants, HBCD is an additive — not chemically bound — so it migrates out of treated textiles and furniture and accumulates in house dust. The bedroom evidence here is unusually direct: in a study of indoor dust across microenvironments, HBCD was the most abundant flame retardant measured in bedroom dust, and its levels in bedding dust correlated with room dust, leading the authors to conclude that bedding was one of the crucial sources of HBCD in the bedroom — and to flag dermal contact with bedding and furniture, alongside dust ingestion, as an exposure route. Peer-reviewed — Wang et al. 2023
The concern: development, not cancer
HBCD is not an IARC carcinogen; its hazard profile is different and arguably more relevant to a nursery. It is an endocrine disruptor with documented thyroid, neurodevelopmental and reproductive effects, Peer-reviewed — Feiteiro et al. 2021 and the US EPA categorises its developmental health effect as "high hazard." Estimated body burdens are highest in toddlers, which is exactly the group for whom a developmental-neurotoxicant matters most. Peer-reviewed — Barghi et al. 2017
Keeping it in proportion
HBCD is being eliminated, and measured intakes for the general population are generally below toxicological reference values — so this is a declining, mostly low-level exposure. Peer-reviewed — Barghi et al. 2017 (body-burden estimates with developmental caveat) But because it is persistent and was used for decades, it remains widespread in existing furniture, textiles, insulation and dust — a legacy that decays slowly, which is why a recently made, FR-free mattress and good dust control both help. Inferred — POP persistence means legacy products and dust keep exposure going after production stops
The regulatory picture — worldwide
HBCD is one of the clearer regulatory success-in-progress stories: identified as a POP, listed for elimination, and phased down — but with a long persistence tail.
Stockholm Convention — global elimination. HBCD was added to Annex A (elimination) of the Stockholm Convention in 2013, committing parties to phase out its production and use, with only a time-limited exemption for EPS/XPS building insulation. Regulatory — Stockholm Convention on POPs, HBCD Annex A (2013)
European Union — REACH authorisation. HBCD was among the first substances placed on the REACH Authorisation List (Annex XIV) as a Substance of Very High Concern, requiring authorisation for continued use and effectively ending most EU applications. Regulatory — EU REACH Annex XIV (Authorisation List), HBCD as SVHC (PBT)
United States. HBCD has been the subject of EPA risk evaluation under TSCA and is flagged for risk management as a persistent, bioaccumulative substance. Regulatory — US EPA TSCA risk evaluation of HBCD (persistent/bioaccumulative)
The persistence tail. Because HBCD is a POP, the regulatory job is not finished by a ban: it remains in legacy products, building insulation, recycled materials and house dust, so exposure declines slowly even after use stops. Peer-reviewed — Feiteiro et al. 2021 (persistence/bioaccumulation)
What the research says
- Most abundant FR in bedroom dust. Bedding a crucial source; dermal + ingestion routes. Peer-reviewed — Wang et al. 2023
- A Stockholm POP. Persistent, bioaccumulative, toxic; Annex A (2013). Regulatory — Stockholm Convention
- Endocrine & developmental concern. Thyroid/neurodev/repro; EPA "high hazard" developmental. Peer-reviewed — Feiteiro et al. 2021; Barghi et al. 2017
- Toddlers most exposed. Highest estimated body burdens. Peer-reviewed — Barghi et al. 2017
What helps reduce it
Control dust. HEPA vacuuming, damp-dusting and hand-washing before eating cut brominated-FR dust exposure — the main route, and the lever for a legacy POP. Peer-reviewed — Barghi et al. 2017 (dust ingestion a major pathway)
Choose FR-free, recently made furnishings. Newer mattresses and furniture meeting flammability standards without added halogenated FRs avoid HBCD; older treated upholstery is the legacy reservoir. Inferred — HBCD use has been phased out; legacy products are the remaining source
Encase and launder bedding. Since bedding is a documented source, washable covers and regular laundering reduce the bedding-dust contribution. Peer-reviewed — Wang et al. 2023 (bedding a source)
What does NOT help
- Assuming a ban means it's gone. As a POP, HBCD persists in legacy furniture, insulation and dust well after production stops. Regulatory — Stockholm POP persistence
- Air filtration alone. HBCD rides on settled dust and is contacted via bedding; vacuuming and damp-dusting matter more. Inferred
Open research questions
- How fast bedroom HBCD dust declines as treated furnishings age out and are replaced. Speculation
- The developmental significance of low-level early-life HBCD exposure given its thyroid activity. Speculation
- How much recycled polystyrene insulation re-introduces legacy HBCD into homes. Speculation
The Embr Exposure Ledger: Hexabromocyclododecane (HBCD)
One chemical, several public questions, answered from independent datasets and joined here — the environment it shows up in, the body burden it carries, how it is regulated, and what actually reduces it.
Detection and body-burden figures are occurrence data, not a personal measurement or a health diagnosis. Part of the Embr Exposure Ledger — an open, cross-dataset chemical join (download the data), reusable with attribution.
Citations
- Wang Junchang, et al. (2023). HBCDs and TBBPA in indoor dust from different microenvironments. Environ. Geochem. Health. HBCDs most abundant in bedroom dust; bedding a crucial source; dermal contact with bedding/furniture an exposure route. Via Consensus. DOI 10.1007/s10653-023-01620-w Peer-reviewed
- Feiteiro J, et al. (2021). Health toxicity effects of brominated flame retardants. Environ. Pollut. HBCD in furniture/textiles/electronics; endocrine disruptor; thyroid/neurodev/repro effects; persistent/bioaccumulative. Via Consensus. DOI 10.1016/j.envpol.2021.117475 Peer-reviewed
- Barghi M, et al. (2017). Human exposure to HBCD and TBBPA via indoor dust in Korea. Sci. Total Environ. HBCD via diet + dust; high toddler body burden; EPA "high hazard" developmental effect. Via Consensus. DOI 10.1016/j.scitotenv.2017.03.200 Peer-reviewed
- Stockholm Convention on Persistent Organic Pollutants. HBCD listed in Annex A (elimination), 2013; PBT, long-range transport; time-limited EPS/XPS insulation exemption. pops.int Regulatory
Frequently asked questions
What is HBCD?
Hexabromocyclododecane (HBCD) is a brominated flame retardant. Its two big uses are expanded and extruded polystyrene (EPS/XPS) building insulation and the back-coating applied to upholstery and other textiles to make them flame-resistant. That textile back-coating is the bedroom-relevant use: it puts a brominated flame retardant directly into the fabric layer of furniture and some furnishings. HBCD is persistent, builds up in the body and the environment, and is now globally restricted.
Is HBCD a carcinogen?
It is not classified by IARC as a carcinogen, and this page does not claim it is. Its problems are different: HBCD is a persistent organic pollutant — persistent, bioaccumulative and toxic — and it is an endocrine disruptor with documented thyroid, neurodevelopmental and reproductive effects in studies. The US EPA categorises its developmental health effect as "high hazard." So HBCD is a developmental and persistence concern, not a cancer one.
Why does it matter in the bedroom?
Because it migrates out of treated textiles and furniture into house dust, and the bedroom is no exception. In a study of indoor dust, HBCD was actually the most abundant flame retardant measured in bedroom dust, and HBCD levels in bedding dust correlated with room dust — leading the authors to identify bedding as one of the crucial sources of HBCD in the bedroom, alongside dermal contact with bedding and furniture. As with the other brominated retardants, toddlers carry the highest estimated body burdens.
Is HBCD still used?
It is being phased out globally but lingers. HBCD was added to Annex A of the Stockholm Convention in 2013, targeting it for elimination, with only a time-limited exemption for polystyrene building insulation. The EU restricted it under REACH authorisation, and use has fallen. But because it is persistent and was used for decades in furniture, textiles and insulation, it remains widespread in existing products, in house dust and in the environment — so the bedroom exposure is a legacy that decays slowly.
Related compounds
Embr is a sleep environment company researching and addressing the chemistry of the bedroom. Research and product development in progress. This page is informational and is not medical advice.
Last reviewed 2026-06-29. If you find a factual error, contact us.