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Flame retardants

Hexabromocyclododecane

Also known as Saytex hbcd, Pyrovatex 3887, Cyclododecane, hexabromo-

CAS 25637-99-4Formula C12H18Br6Molar mass 641.70 g/molEC 247-148-4
GHS signal word: Warning. Pictograms: Serious health hazard Controlled, licensed buyers only
Request as a licensed buyer Safety data
Hexabromocyclododecane chemical structure, C12H18Br6, CAS 25637-99-4
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
White solid
Melting point
185.9 °C
Boiling point
>190
Density
2.2-2.4 g/cm³
Solubility
In water, 0.0656 mg/L at 20 °C /Technical product/
HS code
290389
Category
Flame retardants
UN number
UN 3077

What is Hexabromocyclododecane?

Plain description, key identifiers and synonyms

Hexabromocyclododecane is a white powder. Insoluble in water. (NTP, 1992)

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1,3,5,7,9,11-hexabromocyclododecane
CAS number
25637-99-4 CAS number cross-checkedOther or deprecated CAS: 1093632-34-8
EC number
247-148-4
Molecular formula
C12H18Br6
InChIKey
LEOCKULGXOQRTQ-UHFFFAOYSA-N
InChI
InChI=1S/C12H18Br6/c13-7-1-8(14)3-10(16)5-12(18)6-11(17)4-9(15)2-7/h7-12H,1-6H2
SMILES (canonical and isomeric)
C1C(CC(CC(CC(CC(CC1Br)Br)Br)Br)Br)Br

Synonyms

  • Saytex hbcd
  • Pyrovatex 3887
  • Cyclododecane, hexabromo-
  • HBCDD
  • 1,3,5,7,9,11-hexabromocyclododecane
  • Hexabromocyclododecane (Mixture of Diastereomers)
  • Hexabromocyclododecane Solution in Acetone, 100ug/mL

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
White solidexp.
Odour
Odorlessexp.
Melting point
185.9 °Cexp.
Boiling point
>190exp.
Density
2.2-2.4 g/cm³exp.
Solubility
In water, 0.0656 mg/L at 20 °C /Technical product/exp.
Vapour pressure
4.70 × 10⁻⁷ mm Hg at 21 °C /OECD Guideline 104 (Vapor Pressure Curve)/exp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
641.70 g/molcalc.
Exact mass
635.6509 Dacalc.
LogP (octanol/water)
6.92calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
18calc.
Rings
1calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Fails (2 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, C1CCCCCCCCCCC1

C1CCCCCCCCCCC1

1 ring, 12 atoms, the Cyclododecane ring system.

189 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS08: Serious health hazard
Serious health hazard

Hazard statements

  • H361Suspected of damaging fertility or the unborn child.
  • H362May cause harm to breast-fed children.
Precautionary statements (9)
  • P203Obtain, read and follow all safety instructions before use.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P263Avoid contact during pregnancy and while nursing.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P318If exposed or concerned, get medical advice.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 3077
Transport hazard class
9
Packing group
III

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Hexabromocyclododecane suppliers

Controlled substance, listings of documented suppliers only, in the documented ranking

Persistent organic pollutant

Hexabromocyclododecane is controlled. Only documented suppliers can list it, and buyers must upload a valid licence with their request. Every request is reviewed before suppliers see it.

Licensed buyers only, every enquiry is reviewed by our compliance team.

Reference: Stockholm Convention Annex A persistent organic pollutant

Our policy on controlled substances
No documented supplier lists it yet

Licensed buyers can post a request for Hexabromocyclododecane with their licence. Our compliance team reviews it before suppliers see it.

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Hexabromocyclododecane price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Widely used brominated flame retardant.

Additive to expanded and extruded polystyrene foams for thermal insulation of buildings ... to a lesser extent to high-impact polystyrene used in enclosures for electronic equipment, such as televisions.

The use of HBCDD in polypropylene (PP), adhesives, latex binders and unsaturated polyester has been reported in the USA. ...The use of HBCDD in polypropylene (PP) is confirmed. HBCDD can be used in adhesives and coatings and in SAN resins (styrene-acrylonitrile copolymer). It may also be used in PVC (wires, cables and textile coatings).

HBCDD is used in several products, some of which are available to consumers.

Read more

Some examples of end-products containing HBCDD are: flat and pile upholstered furniture, upholstery seatings in transportation, draperies, and wall coverings, bed mattress ticking, interior textiles, automobile interior textiles, car cushions, insulation boards of transport vehicles, insulation boards in building constructions, parking decks, insulation boards against frost heaves of road and railway embankments, packaging material, electrical and electronic equipment, video cassette housings, polyvinyl chloride wire, cable and textile coating, protecting paints for military purposes.

Functional uses

  • Flame retardant

How it is made

An aliphatic, brominated cyclic alkane produced by bromination of cyclododecatri-1,5,9-ene

Technical grade HBCDD is generally produced from cis, trans, trans-1,5,9-cyclododecatriene (CDT), one of four CDT isomers, (CAS No. 27070-59-3). The reaction, trans-addition of bromine to the double bonds of CDT, results in the three diastereomers alpha-, beta- and gamma- HBCDD.

Produced by the addition reaction of bromine to trans, trans, cis-1,5,9-cyclododecatriene, the cyclic trimer of butadiene.

Read more

The hexabromocyclododecane that is obtained from this reaction consists of a mixture of stereoisomers of 1,2,5,6,9,10-hexabromocyclododecane ranging from oils to an isomer with a 205-208 °C melting point. Commercially available hexabromocyclododecane contains a mixture of solid isomers and has a melting point range of 170-180 °C (185-195 °C).

Regulatory status

Inventories, regulations and trade controls that list this substance

Persistent organic pollutant

Hexabromocyclododecane is controlled. Only documented suppliers can list it, and buyers must upload a valid licence with their request. Every request is reviewed before suppliers see it.

Licensed buyers only, every enquiry is reviewed by our compliance team.

Reference: Stockholm Convention Annex A persistent organic pollutant

Our policy on controlled substances

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 602-109-00-4[1]

Health and food

  • EU Cosmetics Regulation Annex II, prohibited in cosmetics
    Name: Hexabromocyclododecane [1], 1,2,5,6,9,10-Hexabromocyclododecane [2], Ref no: 1546, Annex ref: II/1546

Agriculture and environment

  • Stockholm Convention persistent organic pollutant

United States

  • TSCA inventory (USA)
    Status: Active in US commerce, Regulatory flags: Significant new use rule

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Hexabromocyclododecane is traded under.

HS 2903.89Indicative HS code

Halogenated derivatives of cyclanic, cyclenic or cycloterpenic hydrocarbons, other

World exports in 2024
$92.3M
−2.2% vs 2023, imports $90.8M
2019 to 2024
Top exporters
  1. China40.4%
  2. Japan26.5%
  3. United Kingdom7.2%
Top importers
  1. South Korea19.2%
  2. Japan16.6%
  3. United States15.8%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Hexabromocyclododecane is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Hexabromocyclododecane, based on the data on this page

What is Hexabromocyclododecane?

Hexabromocyclododecane is a white powder. Insoluble in water. (NTP, 1992)

What is Hexabromocyclododecane used for?

Widely used brominated flame retardant. Additive to expanded and extruded polystyrene foams for thermal insulation of buildings ... to a lesser extent to high-impact polystyrene used in enclosures for electronic equipment, such as televisions.

Is Hexabromocyclododecane hazardous?

Hexabromocyclododecane carries the GHS signal word "Warning". Main hazards: suspected of damaging fertility or the unborn child, may cause harm to breast-fed children. This summary is not an SDS, always read the supplier safety data sheet.

Can I buy Hexabromocyclododecane on CompoundList?

Hexabromocyclododecane is a controlled substance. Only documented suppliers can list it, and buyers must upload a valid licence with their request. Every request is reviewed by our compliance team before suppliers see it.

Guides for buyers

Practical guides that help when you source, ship or handle Hexabromocyclododecane

Request as a licensed buyer

Upload your licence with the request. Our compliance team reviews it before the documented suppliers see it.
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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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