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HEXABROMOCYCLODODECANE (MIXTURE OF ISOMERS)ICSC: 1413
Cyclododecane, hexabromo (mixture of isomers)
HBCDD
November 2019
CAS #: 25637-99-4
UN #: 3077
EC Number: 247-148-4

  ACUTE HAZARDS PREVENTION FIRE FIGHTING
FIRE & EXPLOSION Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.        In case of fire in the surroundings, use appropriate extinguishing media.   

See EFFECTS OF LONG-TERM OR REPEATED EXPOSURE. PREVENT DISPERSION OF DUST! AVOID EXPOSURE OF BREASTFEEDING WOMEN!  
  SYMPTOMS PREVENTION FIRST AID
Inhalation   Avoid inhalation of dust. Use ventilation (not if powder). Use local exhaust.  Fresh air. 
Skin   Protective gloves.  Rinse and then wash skin with water and soap. 
Eyes Redness. Itching.  Wear safety spectacles.  Rinse with plenty of water (remove contact lenses if easily possible). Refer for medical attention if irritation persists. 
Ingestion   Do not eat, drink, or smoke during work. Wash hands before eating.  Rinse mouth. 

SPILLAGE DISPOSAL CLASSIFICATION & LABELLING
Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Do NOT let this chemical enter the environment. Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Then store and dispose of according to local regulations. 

According to UN GHS Criteria

cancer;health hazenviro;aqua
WARNING
Suspected of damaging fertility or the unborn child
May cause harm to breast-fed children
Very toxic to aquatic life with long lasting effects 

Transportation
UN Classification
UN Hazard Class: 9; UN Pack Group: III 

STORAGE
Separated from strong oxidants. Provision to contain effluent from fire extinguishing. Store in an area without drain or sewer access. 
PACKAGING
Marine pollutant. 
HEXABROMOCYCLODODECANE (MIXTURE OF ISOMERS) ICSC: 1413
PHYSICAL & CHEMICAL INFORMATION

Physical State; Appearance
WHITE POWDER OR GRANULES 

Physical dangers
 

Chemical dangers
Reacts with strong oxidants. 

Formula: C12H18Br6
Molecular mass: 641.7
Decomposes at >190°C
Melting point: 170-209°C (see Notes)
Density: 2.2-2.4 g/cm³
Solubility in water, mg/l at 20°C: 0.066 (practically insoluble)
Vapour pressure at 20°C: negligible
Octanol/water partition coefficient as log Pow: 5.62 (technical grade) 


EXPOSURE & HEALTH EFFECTS

Routes of exposure
Exposure mainly occurs via inhalation of dust. 

Effects of short-term exposure
May cause mechanical irritation to the eyes. 

Inhalation risk
A nuisance-causing concentration of airborne particles can be reached quickly when dispersed, especially if powdered. 

Effects of long-term or repeated exposure
Animal tests show that this substance possibly causes toxicity to human reproduction or development. This substance may cause harm to breast-fed children. 


OCCUPATIONAL EXPOSURE LIMITS
 

ENVIRONMENT
The substance is very toxic to aquatic organisms. The substance may cause long-term effects in the aquatic environment. Bioaccumulation of this chemical may occur along the food chain, for example in seafood, terrestrial organisms and plants. It is strongly advised not to let the chemical enter into the environment because it is persistent. 

NOTES
Technical HBCDD is made up of three main isomers: beta-HBCDD (CAS No 134237-51-7); alpha-HBCDD (CAS No 134237-50-6); gamma-HBCDD (CAS No 134237-52-8).
The technical grade HBCDD consists of approximately 70-95 % γ-HBCDD and 3-30 % of α- and β-HBCDD, depending on the production method.
Melting points of the isomers: 179-181 °C for α-HBCDD, 170-172 °C for β-HBCDD, 207-209 °C for γ-HBCDD. 

ADDITIONAL INFORMATION
  EC Classification
H361; H362 

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    See Also:
       Toxicological Abbreviations