Acetylene

Modify Date: 2026-07-01 19:55:03

Acetylene Structure
Acetylene structure
 Common Name Acetylene
CAS Number 74-86-2 Molecular Weight 26.037
Density 0.6±0.1 g/cm3 Boiling Point -28 ºC
Molecular Formula C2H2 Melting Point -88°C
MSDS N/A Flash Point -18 ºC

 Names

This table lists Chinese names, IUPAC names and various aliases of this chemical substance.

Name acetylene
Synonym More Synonyms

 Chemical & Physical Properties

This table shows physicochemical parameters including melting point, boiling point, density, solubility and optical rotation. Missing data is marked as N/A.

Density 0.6±0.1 g/cm3
Boiling Point -28 ºC
Melting Point -88°C
Molecular Formula C2H2
Molecular Weight 26.037
Flash Point -18 ºC
Exact Mass 26.015650
LogP 0.37
Vapour Pressure 69690.6±0.1 mmHg at 25°C
Index of Refraction 1.316
InChIKey HSFWRNGVRCDJHI-UHFFFAOYSA-N
SMILES C#C
Water Solubility 0.106 g/100 mL

 MSDS

This table provides MSDS information including hazard classification, first‑aid, fire‑fighting, spill handling, operation and storage instructions.

 Toxicological Information

This table summarizes toxicological test data, acute & chronic toxicity and ecological hazard parameters for this chemical.

CHEMICAL IDENTIFICATION

RTECS NUMBER :
AO9600000
CHEMICAL NAME :
Acetylene
CAS REGISTRY NUMBER :
74-86-2
LAST UPDATED :
199712
DATA ITEMS CITED :
22
MOLECULAR FORMULA :
C2-H2
MOLECULAR WEIGHT :
26.04
WISWESSER LINE NOTATION :
1UU1

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :
TCLo - Lowest published toxic concentration
ROUTE OF EXPOSURE :
Inhalation
SPECIES OBSERVED :
Human
DOSE/DURATION :
20 pph
TOXIC EFFECTS :
Behavioral - headache Lungs, Thorax, or Respiration - dyspnea
REFERENCE :
34ZIAG "Toxicology of Drugs and Chemicals," Deichmann, W.B., New York, Academic Press, Inc., 1969 Volume(issue)/page/year: -,67,1969
TYPE OF TEST :
LCLo - Lowest published lethal concentration
ROUTE OF EXPOSURE :
Inhalation
SPECIES OBSERVED :
Human
DOSE/DURATION :
50 pph/5M
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
TABIA2 Tabulae Biologicae. (The Hague, Netherlands) V.1-22, 1925-63. Discontinued. Volume(issue)/page/year: 3,231,1933
TYPE OF TEST :
LCLo - Lowest published lethal concentration
ROUTE OF EXPOSURE :
Inhalation
SPECIES OBSERVED :
Mammal - species unspecified
DOSE/DURATION :
50 pph/5M
REFERENCE :
AEPPAE Naunyn-Schmiedeberg's Archiv fuer Experimentelle Pathologie und Pharmakologie. (Berlin, Ger.) V.110-253, 1925-66. For publisher information, see NSAPCC. Volume(issue)/page/year: 138,65,1928 *** REVIEWS *** ACGIH TLV-Simple asphyxiant, NO TWA DTLVS* The Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) booklet issues by American Conference of Governmental Industrial Hygienists (ACGIH), Cincinnati, OH, 1996 Volume(issue)/page/year: TLV/BEI,1997 *** U.S. STANDARDS AND REGULATIONS *** MSHA STANDARD:ASPHYXIANTS/GASES DTLWS* "Documentation of the Threshold Limit Values for Substances in Workroom Air," Supplements. For publisher information, see 85INA8. Volume(issue)/page/year: 3,8,1973 OSHA PEL (Construc):simple asphyxiant - inert gas and vapor CFRGBR Code of Federal Regulations. (U.S. Government Printing Office, Supt. of Documents, Washington, DC 20402) Volume(issue)/page/year: 29,1926.55,1994 OSHA PEL (Shipyard):Simple asphyxiant - inert gas and vapor CFRGBR Code of Federal Regulations. (U.S. Government Printing Office, Supt. of Documents, Washington, DC 20402) Volume(issue)/page/year: 29,1915.1000,1993 OSHA PEL (Fed Cont):Simple asphyxiant - inert gas and vapor CFRGBR Code of Federal Regulations. (U.S. Government Printing Office, Supt. of Documents, Washington, DC 20402) Volume(issue)/page/year: 41,50-204.50,1994 *** OCCUPATIONAL EXPOSURE LIMITS *** OEL-ARAB Republic of Egypt:TWA 1 ppm (14 mg/m3) JAN 1993 OEL-AUSTRALIA:Asphyxiant JAN 1993 OEL-BELGIUM:Asphyxiant JAN 1993 OEL-HUNGARY:Asphyxiant JAN 1993 OEL-THE NETHERLANDS:Asphyxiant JAN 1993 OEL-SWITZERLAND:TWA 1000 ppm (1080 mg/m3) JAN 1993 OEL-UNITED KINGDOM:Asphyxiant JAN 1993 OEL IN BULGARIA, COLOMBIA, JORDAN, KOREA check ACGIH TLV OEL IN NEW ZEALAND, SINGAPORE, VIETNAM check ACGIH TLV *** NIOSH STANDARDS DEVELOPMENT AND SURVEILLANCE DATA *** NIOSH RECOMMENDED EXPOSURE LEVEL (REL) : NIOSH REL TO ACETYLENE-air:CL 2500 ppm/15M REFERENCE : NIOSH* National Institute for Occupational Safety and Health, U.S. Dept. of Health, Education, and Welfare, Reports and Memoranda. Volume(issue)/page/year: DHHS #92-100,1992 NIOSH OCCUPATIONAL EXPOSURE SURVEY DATA : NOHS - National Occupational Hazard Survey (1974) NOHS Hazard Code - 03298 No. of Facilities: 85909 (estimated) No. of Industries: 341 No. of Occupations: 111 No. of Employees: 704679 (estimated) NOES - National Occupational Exposure Survey (1983) NOES Hazard Code - 03298 No. of Facilities: 2514 (estimated) No. of Industries: 41 No. of Occupations: 52 No. of Employees: 48962 (estimated) No. of Female Employees: 3072 (estimated)

 Safety Information

This table covers safety warnings, protective measures, incompatible substances and disposal guidelines for this compound.

Hazard Codes F+:Highlyflammable;
Risk Phrases R5
Safety Phrases S9-S16-S33
RIDADR UN 1001
Hazard Class 2.1
HS Code 2901292000

 Customs

This table shows customs‑related data including HS‑code, tariff and regulatory conditions for import and export.

HS Code 2901292000
Summary 2901292000 ethyne。supervision conditions:AB(certificate of inspection for goods inward,certificate of inspection for goods outward)。VAT:17.0%。tax rebate rate:9.0%。MFN tarrif:2.0%。general tariff:45.0%

 Synonyms

This table collects all English aliases, systematic names and CAS‑related synonyms of the compound.

Welding Gas
MFCD00008567
4-01-00-00939
Ethyne
C2H2
Ethine
vinylene
Acetylen
EINECS 200-816-9
ethenylene
Narcylen
Acetylene

 Acetylene | FAQ

This section contains frequently‑asked‑questions about this compound, including basic parameters, properties, storage conditions and corresponding answers.

Q: What English synonyms does acetylene have?
A: English synonyms of acetylene: Welding Gas, MFCD00008567, 4-01-00-00939, Ethyne, C2H2, Ethine, vinylene, Acetylen, EINECS 200-816-9, ethenylene, Narcylen, Acetylene.
Q: How is the water solubility of acetylene?
A: Water solubility of acetylene: 0.106 g/100 mL.
Q: What is the melting point of acetylene?
A: Melting point of acetylene is -88°C.
Q: What is the SMILES notation of acetylene?
A: SMILES notation of acetylene is C#C.
Q: What is the boiling point of acetylene?
A: Boiling point of acetylene is -28 ºC.
Q: What are the downstream products of acetylene?
A: Related downstream products(CAS) of acetylene: 38788-38-4;63000-06-6;105442-63-5;120569-65-5;107734-14-5;104846-76-6;109322-46-5;104846-78-8;111854-28-5;51112-72-2.
Q: What is the InChIKey of acetylene?
A: InChIKey of acetylene is HSFWRNGVRCDJHI-UHFFFAOYSA-N.
Q: What is the molecular weight of acetylene?
A: Molecular weight of acetylene is 26.037.
Q: What is the safety information for acetylene?
A: Safety information for acetylene: S9-S16-S33.
Q: What is the LogP of acetylene?
A: LogP of acetylene is 0.37.

 Acetylenefactory

This table lists manufacturers and suppliers of this compound, including vendor names and product supply reference information.

Dayang Chem (Hangzhou) Co., Ltd.
Henan Tianfu Chemical Co., Ltd.
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