CompoundList
Sign in
Specialty and electronic gases

Acetylene

Also known as Ethyne, Narcylen, Ethine

CAS 74-86-2Formula C2H2Molar mass 26.04 g/molEC 200-816-9
GHS signal word: Danger. Pictograms: Flammable, Gas under pressure 100 suppliers listed
Get quotes Compare 100 suppliers
Acetylene chemical structure, C2H2, CAS 74-86-2
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Colorless gas [Note: Shipped under pressure dissolved in acetone]
Melting point
-80.7 °C
Boiling point
-84.7 °C
Density
0.377 g/cm³ (pressure >1 atm)
Flash point
-18.1 °C
HS code
290129
Category
Specialty and electronic gases
UN number
UN 1001
Illustrative photo, a gas cylinder on a trolley on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Acetylene?

Plain description, key identifiers and synonyms

Acetylene is a gas molecular entity, an alkyne and a terminal acetylenic compound.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
acetylene
CAS number
74-86-2 CAS number cross-checked
EC number
200-816-9
Molecular formula
C2H2
UNII
OC7TV75O83
InChIKey
HSFWRNGVRCDJHI-UHFFFAOYSA-N
InChI
InChI=1S/C2H2/c1-2/h1-2H
SMILES (canonical and isomeric)
C#C

Synonyms

  • Ethyne
  • Narcylen
  • Ethine
  • Acetylen
  • Vinylene
  • acetylene, ethyne
  • Azetylen
  • Ethin
  • CH#CH
  • HC#CH
  • Acetylene (1,2-13c2)
  • Acetylene (d1)
  • [CH(CH)]
  • Ethenylene
  • Dicarbon
  • Welding Gas
  • Acetylene, dissolved
  • Carbon (C2)
  • Des-Gln24-Tirzepatide
  • UN 1001
  • Acetylene, dissolved [UN1001] [Flammable 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 [Note: Shipped under pressure dissolved in acetone]exp.
Odour
Not unpleasant odor unless impure (due to phosphine)exp.
Melting point
-80.7 °Cexp.
Boiling point
-84.7 °Cexp.
Density
0.377 g/cm³ (pressure >1 atm)exp.
Flash point
-18.1 °Cexp.
Autoignition temperature
305 °Cexp.
Solubility
In water, 1200 mg/L at 25 °Cexp.
Vapour pressure
40 atm at 16.8 °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
26.04 g/molcalc.
Exact mass
26.0157 Dacalc.
LogP (octanol/water)
0.25calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
2calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
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
GHS02: Flammable
Flammable
GHS04: Gas under pressure
Gas under pressure
402WNFPA 704 rating

Hazard statements

  • H220Extremely flammable gas.
Precautionary statements (7)
  • P203Obtain, read and follow all safety instructions before use.
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P222Do not allow contact with air.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P377Leaking gas fire: do not extinguish, unless leak can be stopped safely.
  • P381In case of leakage, eliminate all ignition sources.
  • P403Store in a well-ventilated place.
UN number
UN 1001
Transport hazard class
2.1

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

Acetylene suppliers

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

All 100 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

100 suppliers in 42 countries

Send one request to many suppliers

Choose up to 10 suppliers or let us match your request. Compare quotes side by side, free.

Choose suppliersPost a request

Acetylene 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.

Get latest price

Uses and applications

What the substance is used for, by industry and function

Illuminant, oxyacetylene welding, cutting, and soldering metals, signaling, precipitating metals, particularly copper, manufacture of acetaldehyde, acetic acid.

Used for brazing, ... metallizing, hardening, flame scarfing, and local heating in metallurgy. The flame is also used in the glass industry. Chemically, acetylene is used in the manufacture of ... synthetic rubber, ... butyrolactone, ... vinyl alkyl ether, pyrrolidone.

It is used for brazing, local heating & in glass industry.

In chem indust, acetylene is used as feedstock in mfr of vinyl chloride, acrylonitrile, synthetic rubber, vinyl acetate, trichloroethylene, acrylate, butyrolactone, 1,4-butanediol, vinyl alkyl ethers, pyrrolidone, etc.

Industrial uses: Intermediate, Fuel, Heat transferring agent, Fuel agents, Monomers, Other.

Consumer uses: Intermediate, Fuel, Other.

How it is made

Recovery from refinery gases, from petrochemical raw materials by thermal processes.

Manufactured from calcium carbide and water: Eastman, United States of America patent 3017259 (1962 to Texaco), from methane: Anderson, United States of America patent 3051639 (1962 to Union Carbide).

Acetylene is obtained from gaseous hydrocarbons (eg methane) or liquid hydrocarbons (eg petroleum products) by partial combustion, electric arc or by high temp regenerative processes. Acetylene must then be separated from resultant gas mixture.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 601-015-00-0

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 Acetylene is traded under.

HS 2901.29Indicative HS code

Unsaturated, other

World exports in 2024
$2.65B
−3.2% vs 2023, imports $2.57B
2019 to 2024
Top exporters
  1. United States43.9%
  2. South Africa15.3%
  3. Qatar * partner reported9.0%
Top importers
  1. Singapore10.9%
  2. United States10.1%
  3. South Korea8.7%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Acetylene?

Acetylene is a gas molecular entity, an alkyne and a terminal acetylenic compound.

What is the CAS number of Acetylene?

The CAS registry number of Acetylene is 74-86-2.

What is the molecular formula and weight of Acetylene?

The molecular formula of Acetylene is C2H2 and its molar mass is 26.04 g/mol.

What is Acetylene used for?

Illuminant, oxyacetylene welding, cutting, and soldering metals, signaling, precipitating metals, particularly copper, manufacture of acetaldehyde, acetic acid. Used for brazing, ... metallizing, hardening, flame scarfing, and local heating in metallurgy. The flame is also used in the glass industry.

Is Acetylene hazardous?

Acetylene carries the GHS signal word "Danger". Main hazards: extremely flammable gas. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Acetylene?

Acetylene is usually classified under HS code 290129 (Unsaturated, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Acetylene?

CompoundList lists 100 suppliers of Acetylene in United States, India, South Korea, China and 38 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Acetylene in India?

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

What is the price of Acetylene?

Suppliers quote Acetylene 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 Acetylene

Get quotes for Acetylene

Post one free request with your grade, quantity and destination. Matching suppliers send quotes you can compare side by side.
Post a request Sell Acetylene
Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
Embed this structure on your websiteShow code

Paste this code into your page to show the 2D structure of Acetylene with a 3D view, its CAS number and a link back to this page. Free to use with the link kept.

<iframe src="https://www.compoundlist.com/embed/structure/acetylene-74-86-2" title="Acetylene structure on CompoundList" width="360" height="420" style="border:1px solid #E7E2DA;border-radius:12px;max-width:100%" loading="lazy" referrerpolicy="strict-origin-when-cross-origin"></iframe>
Preview the embed

Explore more in Specialty and electronic gases or HS code 290129

100 suppliers
Free quotes, contact stays private
Get quotes