Acetylene (C2H2)

Acetylene is a highly flammable gaseous hydrocarbon. It is colourless, unstable and highly combustible with a strong garlic odour. Used in welding and the manufacture of chemicals, this gas produces a very hot flame (over 3000°C or 5400°F) when combined with oxygen.

It is a very unstable compound and decomposes with ignition within a wide range of pressures and temperatures, for this reason acetylene is shipped as a stabilized solution under pressure and dissolved in acetone.

Warnings:

  • Heating may cause an explosion.
  • Explosive with or without contact with air.
  • Extremely flammable.

 Be safe:

  • Do not discharge the acetylene cylinder at pressures above 15 psig (103kpa).
  • Do not empty the cylinder below 5 psig.
  • Recommended for atomic absorption.
  • Keep container in well ventilated place.
  • Keep away from source of ignition.
  • Take precautionary measures against static discharges.

Properties  

U.S. Units 

S.I. Units 

Chemical formula

C2H2

C2H2

Molecular weight

26.04

26.04

Density of the gas at 70°F(21.1°C) and 1atm.

0.069 lb/ft3

1.107kg/m3

Specific gravity of the gas 70°F (21.1°C) and 1 atm (air = 1)

0.91

0.91

Specific volume of the gas 70°F (21.1°C) and 1 atm

14.7 ft3/lb

0.918 m3/kg

Density of the liquid saturated at 70°F (21.1°C)

24.0 lb/ft3

384 kg/m3

Melting point at 10psig (170 kpa abs)

-116°F

-82.2°C

Critical temperature

96.8°F

36.0°C

Critical pressure

907 psia

6254 KPa, abs

Critical density

14.4 lb/ft3

231 kg/m3

Boiling point at 10psig (170 kpa abs)

-103°F

-75.0°C

Vapour pressure at 70°F (21.1°C)

635 psig

4378 kPa

Solubility in water vol/vol at 32°F(0°C)& 1 atm.

1.72

1.72

Industry 

Usage 

 Metal fabrication

 Oxygen cutting welding and brazing

 Glass

 Lubrication of bottle production molds

 Chemical

 Industrial and chemical synthesis

 Atomic

 Fuel for atomic absorption instruments

 Paper

 Paper pulp bleaching

Other applications

Water purification, odour control, tea, fermentation

Grade 

Cylinder Type 

Pressure (Barg) 

2.5 (Purity > 99.5%)

40L

17.2

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