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Oxides and peroxides

Oxygen

Also known as Molecular oxygen, oxygen molecule, Dioxygen

CAS 7782-44-7Formula O2Molar mass 32.00 g/molEC 231-956-9
GHS signal word: Danger. Pictograms: Oxidiser, Gas under pressure 111 suppliers listed Drug substance
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Oxygen chemical structure, O2, CAS 7782-44-7
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless gas
Melting point
-218.4 °C
Boiling point
-183 °C
Density
Gas: 1.429 g/L at 0 °C, liq: 1.14 g/ml at -183 °C
Solubility
1 vol gas dissolves in 32 vol water at 20 °C, in 7 vol alcohol at 20 °C, sol in other or…
HS code
280440
Category
Oxides and peroxides
UN number
UN 1072
Illustrative photo, industrial gas cylinders secured with a safety chain in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Oxygen?

Plain description, key identifiers and synonyms

Dioxygen is a gas molecular entity, an elemental molecule and a diatomic oxygen. It has a role as a micronutrient, a nutrient, a reagent, an anti-inflammatory drug, an oxidising agent, a Saccharomyces cerevisiae metabolite, a human metabolite and a member of food packaging gas. It is a conjugate base of a hydridodioxygen(1+).

Oxygen is a diatomic molecule of oxygen.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
molecular oxygen
CAS number
7782-44-7 CAS number cross-checkedOther or deprecated CAS: 11062-77-4
EC number
231-956-9
Molecular formula
O2
UNII
S88TT14065
INCI name
OXYGEN
InChIKey
MYMOFIZGZYHOMD-UHFFFAOYSA-N
InChI
InChI=1S/O2/c1-2
SMILES (canonical and isomeric)
O=O

Synonyms

  • Molecular oxygen
  • oxygen molecule
  • Dioxygen
  • Pure oxygen
  • Oxygenium
  • Liquid oxygen
  • Oxygen, liquified
  • Oxygen-16
  • Compressed oxygen
  • Oxygen, compressed
  • INS NO.948
  • Rns60 component oxygen
  • Rns-60 component oxygen
  • Oxygen 16
  • Oxygen gas
  • oxidanone
  • Air Compressed
  • reconstituted Air
  • Oxygen Compressed
  • Nitrogen, Oxygen
  • Oxygen Size B
  • Oxygen Size C
  • Oxygen Size D
  • Oxygen Size E
  • Oxygen Size F
Show all 39 synonyms
  • Oxygen Size H
  • Oxygen Size M
  • Oxygen Size T
  • Helium/Oxygen Mix
  • Oxygen, USP
  • G02 Therapy
  • Ez-OX Plus
  • Nitrogen Oxygen Mix
  • Oxygen Size 400
  • Oxygen, Refrigerated
  • Focus Medical Oxygen
  • Oxygen-helium Mixture
  • Carbon Dioxide Oxygen
  • Oxygen Compressed 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 gasexp.
Odour
Odorlessexp.
Taste
Tastelessexp.
Melting point
-218.4 °Cexp.
Boiling point
-183 °Cexp.
Density
Gas: 1.429 g/L at 0 °C, liq: 1.14 g/ml at -183 °Cexp.
Solubility
1 vol gas dissolves in 32 vol water at 20 °C, in 7 vol alcohol at 20 °C, sol in other organic liquids and usually to a greater extent than in waterexp.
Vapour pressure
1 kPa at -211.9 °C, 10 kPa at -200.5 °C, 100 kPa at -183.1 °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
32.00 g/molcalc.
Exact mass
31.9898 Dacalc.
LogP (octanol/water)
0.07calc.
Topological polar surface area
34.14 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
2calc.
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
GHS04: Gas under pressure
Gas under pressure
030NFPA 704 rating

Hazard statements

  • H270May cause or intensify fire, oxidiser.
Precautionary statements (4)
  • P220Keep away from clothing and other combustible materials.
  • P244Keep valves and fittings free from oil and grease.
  • P370 + P376In case of fire: Stop leak if safe to do so.
  • P403Store in a well-ventilated place.
UN number
UN 1072
Transport hazard class
2.2

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 suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 111 suppliers
30 of 30 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

111 suppliers in 18 countries

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Oxygen 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

Manufacturer of synthesis gas for production of ammonia, methyl alcohol, acetylene, etc, to counteract effect of eutrophication in lakes and reservoirs, coal gasification.

Oxidizing agent in iron and steel industry, synthetic chemical manufacture, air enricher for combustion in lead blast furnaces and in flash smelters for copper and nickel, oxidizing agent for uranium leaching and in pulp and paper industry, air replacement in oxidation of organic wastes, life supporting gas-eg, for medicinal use & space travel, constituent of gaseous anesthetics and welding gases, liquid oxidizer used in rocket propellants, gas for purging and pressurizing rocket engines.

1978: Used for feedstock and enrichment purposes.

In oxyhydrogen or oxyacetylene flame for welding metals and for lighting (calcium light, etc), submarine work by divers... In the production of synthesis gas which can be used in the Fischer-Tropsch for liquid fuels.

Industrial uses: Alloys, Fuel agents.

Consumer uses: Alloys, Fuel agents.

Use classes: Food additives.

Cosmetic ingredient, INCI name OXYGEN(skin conditioning)

Roles

  • analgesic
  • anti-anaemic agent
  • anti-inflammatory agent
  • anti-inflammatory drug
  • anti-ulcer drug
  • antidepressant
  • antidote
  • antifibrotic agent
  • antihypertensive agent
  • antiinfective agent
  • antimicrobial agent
  • antineoplastic agent
  • antipsychotic agent
  • anxiolytic drug
  • cardiovascular drug
  • food packaging gas
  • gastrointestinal drug
  • geroprotector
  • hypoglycemic agent
  • neuroprotective agent
  • reagent
  • renoprotective agent
  • vasodilator agent
  • vulnerary

Functional uses

  • Softener and conditioner

Cosmetic functions

  • Skin conditioning

Pharmacology

Oxygen is an element with atomic symbol O, atomic number 8, and atomic weight 16.

How it is made

Oxygen enrichment from air by pressure-swing adsorption (PSA) ... Compressed air enters the adsorption bed at high pressure. Typical adsorbents are usually based on zeolites. Because zeolite has a higher selectivity for nitrogen, and oxygen is at a lower partial pressure, nitrogen is adsorbed to an appreciably greater extent and oxygen-enriched air is obtained at the outlet. The bed is then blown down to a lower pressure to desorb nitrogen.

Read more

A purge step may sometimes be used to sweep nitrogen out of the bed before a new cycle begins.

Membrane separation of oxygen is accomplished by a thin polymeric film that allows selective transport of oxygen through it as a result of a driving force, such as differential partial pressure. ... Oxygen dissolves into the membrane at its upstream surface and diffuses across the membrane to the downstream surface, where it volatilizes into the adjacent gas phase. Other gases in air also dissolve into the membrane and diffuse along with oxygen, the most important of these is nitrogen. ... Selectivity of a membrane material for oxygen becomes an important design parameter. The preferred membrane material must have both a high permeability and a high selectivity for oxygen.

Oxygen from cryogenic air separation..

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 008-001-00-8

Health and food

  • EU cosmetic ingredient inventory
  • Active ingredient in FDA approved drug labels
  • Food additive

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 Oxygen is traded under.

HS 2804.40Exact HS code

Oxygen

World exports in 2024
$158M
−15.7% vs 2023, imports $202M
2019 to 2024
Top exporters
  1. Belgium13.1%
  2. France * partner reported8.3%
  3. Germany7.9%
Top importers
  1. Netherlands21.1%
  2. Germany13.2%
  3. Luxembourg7.7%

* Partner reported figures, a lower bound.

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

The HS code shown for Oxygen is indicative (it was matched by name in the HS nomenclature). Confirm the classification with your customs broker before shipping.

Frequently asked questions

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

What is Oxygen?

Dioxygen is a gas molecular entity, an elemental molecule and a diatomic oxygen. It has a role as a micronutrient, a nutrient, a reagent, an anti-inflammatory drug, an oxidising agent, a Saccharomyces cerevisiae metabolite, a human metabolite and a member of food packaging gas.

What is the CAS number of Oxygen?

The CAS registry number of Oxygen is 7782-44-7. Other or deprecated CAS numbers: 11062-77-4.

What is the molecular formula and weight of Oxygen?

The molecular formula of Oxygen is O2 and its molar mass is 32.00 g/mol.

What is Oxygen used for?

Manufacturer of synthesis gas for production of ammonia, methyl alcohol, acetylene, etc, to counteract effect of eutrophication in lakes and reservoirs, coal gasification.

Is Oxygen hazardous?

Oxygen carries the GHS signal word "Danger". Main hazards: may cause or intensify fire, oxidiser. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Oxygen?

Oxygen is usually classified under HS code 280440 (Oxygen). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Oxygen?

CompoundList lists 111 suppliers of Oxygen in South Korea, United States, China, India and 14 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Oxygen in India?

4 suppliers in India list Oxygen on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Oxygen?

Suppliers quote Oxygen 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

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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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