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Chlorinated and fluorinated solvents

1,1-Dibromoethane

Also known as Dibromoethane, Ethylidene bromide, Ethylidene dibromide

CAS 557-91-5Formula C2H4Br2Molar mass 187.86 g/molEC 209-184-9
GHS signal word: Danger. Pictograms: Acute toxicity (severe), Harmful or irritant, Serious health hazard 2 suppliers listed
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1,1-Dibromoethane chemical structure, C2H4Br2, CAS 557-91-5
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Liquid
Melting point
-63 °C
Boiling point
108 °C
Density
2.0555 g/cm³ at 20 °C
Solubility
Soluble in ethanol, acetone, and benzene, slightly soluble in chloroform, very soluble i…
HS code
290369
Category
Chlorinated and fluorinated solvents
Illustrative photo, 200 litre steel drums of liquid in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is 1,1-Dibromoethane?

Plain description, key identifiers and synonyms

1,1-Dibromoethane is a chemical substance with the molecular formula C2H4Br2 and a molar mass of 187.86 g/mol. Its CAS registry number is 557-91-5.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1,1-dibromoethane
CAS number
557-91-5 CAS number cross-checkedOther or deprecated CAS: 25620-62-6
EC number
209-184-9
Molecular formula
C2H4Br2
UNII
KJ8ZJY72QQ
MDL number
MFCD00041719
InChIKey
APQIUTYORBAGEZ-UHFFFAOYSA-N
InChI
InChI=1S/C2H4Br2/c1-2(3)4/h2H,1H3
SMILES (canonical and isomeric)
CC(Br)Br

Synonyms

  • Dibromoethane
  • Ethylidene bromide
  • Ethylidene dibromide
  • Ethane, 1,1-dibromo-
  • CH3CHBr2
  • Dibromoethane, 1,1-
  • Ethane, 1,1dibromo
  • 1,1-Dibromoethane (contains stabilizer )
  • dibromethane
  • dibromoethan
  • Dibromoetane
  • dibromo ethane
  • 2-dibromoethane
  • 11-Dibromoethane
  • 1,1-dibromo-ethane
  • Ethane, dibromo-(8CI,9CI)
  • 1,1-Dibromoethane (stabilized with copper chip)
  • 1,1-Dibromoethane9(stabilized with copper chip)

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
Liquidexp.
Melting point
-63 °Cexp.
Boiling point
108 °Cexp.
Density
2.0555 g/cm³ at 20 °Cexp.
Solubility
Soluble in ethanol, acetone, and benzene, slightly soluble in chloroform, very soluble in ether.exp.
Vapour pressure
2.56 × 10⁺¹ mm Hg at 25 °Cexp.

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
187.86 g/molcalc.
Exact mass
185.868 Dacalc.
LogP (octanol/water)
2.12calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
4calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
1calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard

Hazard statements

  • H301Toxic if swallowed.
  • H302Harmful if swallowed.
  • H311Toxic in contact with skin.
  • H312Harmful in contact with skin.
  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H331Toxic if inhaled.
  • H332Harmful if inhaled.
  • H335May cause respiratory irritation.
  • H351Suspected of causing cancer.
Precautionary statements (26)
  • P203Obtain, read and follow all safety instructions before use.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P262Do not get in eyes, on skin, or on clothing.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P317Get medical help.
  • P318If exposed or concerned, get medical advice.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P361 + P364Take off immediately all contaminated clothing. And wash it before reuse.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

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

1,1-Dibromoethane suppliers

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All 2 suppliers

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Where suppliers are based

2 suppliers in 1 country

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1,1-Dibromoethane price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Research chemical.

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code 1,1-Dibromoethane is traded under.

HS 2903.69Indicative HS code

Brominated or iodinated derivatives of acyclic hydrocarbons, other

World exports in 2024
$135M
−18.6% vs 2023, imports $139M
2022 to 2024
Top exporters
  1. China26.7%
  2. United States26.3%
  3. Netherlands12.3%
Top importers
  1. United States13.2%
  2. India * partner reported9.6%
  3. Japan9.3%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for 1,1-Dibromoethane is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about 1,1-Dibromoethane, based on the data on this page

Is 1,1-Dibromoethane hazardous?

1,1-Dibromoethane carries the GHS signal word "Danger". Main hazards: toxic if swallowed, harmful if swallowed, toxic in contact with skin. This summary is not an SDS, always read the supplier safety data sheet.

Guides for buyers

Practical guides that help when you source, ship or handle 1,1-Dibromoethane

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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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