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Silicates, borates and other salts

Oxygen difluoride

Also known as Difluorine monoxide, Fluorine oxide, Oxygen fluoride

CAS 7783-41-7Formula F2OMolar mass 54.00 g/molEC 231-996-7
GHS signal word: Danger. Pictograms: Oxidiser, Corrosive, Acute toxicity (severe) 1 supplier listed
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Oxygen difluoride chemical structure, F2O, CAS 7783-41-7
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless gas, yellowish-brown when liquid
Melting point
-223.8 °C
Boiling point
-144.8 °C
Density
1.90 at -224 °C (LIQ)
Solubility
6.8 ML GAS/100 ML WATER @ 0 °C
HS code
285390
Category
Silicates, borates and other salts
UN number
UN 2190
Illustrative photo, a gas cylinder on a trolley on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Oxygen difluoride?

Plain description, key identifiers and synonyms

Oxygen difluoride is an oxygen halide.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
fluoro hypofluorite
CAS number
7783-41-7 CAS number cross-checked
EC number
231-996-7
Molecular formula
F2O
UNII
7BCS2CW398
InChIKey
UJMWVICAENGCRF-UHFFFAOYSA-N
InChI
InChI=1S/F2O/c1-3-2
SMILES (canonical and isomeric)
O(F)F

Synonyms

  • Difluorine monoxide
  • Fluorine oxide
  • Oxygen fluoride
  • Fluorine monoxide
  • Oxydifluoride
  • Oxygen fluoride (OF2)
  • Fluorine (di-)oxide
  • Difluorure d'oxygene
  • Difluoruro de oxigeno
  • oxyfluoride
  • difluorene monoxide
  • difluoridooxygen
  • Sauerstoffdifluorid
  • [OF2]
  • Difluorine monooxide
  • Oxygen difluoride, compressed
  • UN 2190
  • Oxygen difluoride, compressed [UN2190] [Poison gas]

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
Colorless gas, yellowish-brown when liquidexp.
Odour
PECULIAR SMELLexp.
Melting point
-223.8 °Cexp.
Boiling point
-144.8 °Cexp.
Density
1.90 at -224 °C (LIQ)exp.
Solubility
6.8 ML GAS/100 ML WATER @ 0 °Cexp.
Vapour pressure
760 MM HG @ -144.6 °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
54.00 g/molcalc.
Exact mass
53.9917 Dacalc.
LogP (octanol/water)
0.77calc.
Topological polar surface area
9.23 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
0calc.
Heavy atoms
3calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS03: Oxidiser
Oxidiser
GHS05: Corrosive
Corrosive
GHS06: Acute toxicity (severe)
Acute toxicity (severe)

Hazard statements

  • H270May cause or intensify fire, oxidiser.
  • H314Causes severe skin burns and eye damage.
  • H330Fatal if inhaled.
Precautionary statements (20)
  • P220Keep away from clothing and other combustible materials.
  • P244Keep valves and fittings free from oil and grease.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P320Specific treatment is urgent (see supplemental first aid instructions on the label).
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P363Wash contaminated clothing before reuse.
  • P370 + P376In case of fire: Stop leak if safe to do so.
  • P403Store in a well-ventilated place.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2190
Transport hazard class
2.3

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

Oxygen difluoride suppliers

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Where suppliers are based

1 supplier in 1 country

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Oxygen difluoride price

Indicative price range per kg from live supplier offers

No published prices right now

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Uses and applications

What the substance is used for, by industry and function

Oxidizer in rocket fuel systems.

How it is made

Prepared by passing fluorine slowly through an aq naoh solution.

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2853.90Indicative HS code

Phosphides, whether or not chemically defined, excluding ferrophosphorus, other, other

World exports in 2024
$2.45B
−33.6% vs 2023, imports $816M
2019 to 2024
Top exporters
  1. China68.4%
  2. Israel8.1%
  3. United States4.9%
Top importers
  1. United States19.3%
  2. Japan17.9%
  3. China13.4%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Oxygen difluoride is indicative (it is known at chapter level only). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Oxygen difluoride, based on the data on this page

What is Oxygen difluoride?

Oxygen difluoride is an oxygen halide.

What is the CAS number of Oxygen difluoride?

The CAS registry number of Oxygen difluoride is 7783-41-7.

What is the molecular formula and weight of Oxygen difluoride?

The molecular formula of Oxygen difluoride is F2O and its molar mass is 54.00 g/mol.

What is Oxygen difluoride used for?

Oxidizer in rocket fuel systems.

Is Oxygen difluoride hazardous?

Oxygen difluoride carries the GHS signal word "Danger". Main hazards: may cause or intensify fire, oxidiser, causes severe skin burns and eye damage, fatal if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Oxygen difluoride?

Oxygen difluoride is usually classified under HS code 285390 (Phosphides, whether or not chemically defined, excluding ferrophosphorus, other…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Oxygen difluoride?

CompoundList lists 1 supplier of Oxygen difluoride in China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Oxygen difluoride?

Suppliers quote Oxygen difluoride on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Oxygen difluoride

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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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