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Methane Gas CH4

Methane is a colorless and odorless flammable gas at normal temperature and pressure, and has an aromatic oil-like smell when the concentration is greater than 5000ppm. It is flammable and emits a bluish-white flame when burning, which can form explosive mixtures with air.
Availability:
Quantity:
  • 74-82-8

  • OEM/ODM

Technical Indicators

Components/Impurities

Methane/3.0N

Methane/4.0N

Methane/5.0N

Methane content

99.9%

99.99%

99.999%

Hydrogen H2

≤50ppm

≤10ppm

≤0.5ppm

Ethane C2H6

≤600ppm

≤25ppm

≤4ppm

Oxygen O2 + Argon Ar

≤50ppm

≤10ppm

≤1ppm

Nitrogen N2

≤250ppm

≤35ppm

≤4ppm

Water H2O

≤50ppm

≤15ppm

≤3ppm


The packing

Type of cylinder

gas pressure

Gas volume

Net weight of gas

50L cylinder

200MPa

10000L

7.14kg

49L cylinder

16.5MPa

8080L

5.769kg

40L cylinder

13.5MPa

5400L

3.855kg

10L cylinder

10MPa

1000L

0.714kg

Cylinder interface: QF-30, outlet thread W21.8×1/14-LH.


Transport information

Transportation information

Chemical symbol

CH4

GAS No.

74-82-8

DOT Shipping Class

flammable gas

DOT tags

flammable gas

Canadian Shipping Classification

2.1

Substance Identification (S) No.

1971

UN No.

UN1971

Main hazards

High pressure compression, flammable

Toxicity (TLV)

asphyxia

Explosive Limits (Toxic)

5%~15.4%

Smell

none


Physical properties

Physical properties

Chemical name

CH4

Molar mass

16.043

Liquid Density (-161.52℃,1atm)

422.62kg/m3

Gas density (270k, 100kPa)

0.716kg/m3

Relative density (0℃, 1atm)

0.555

Gas specific volume (21.1℃. 101.325kPa)

1.4795m3/kg

Boiling point at 1 atm

-161.5℃

Freezing point at 1 atm

-182.6℃

Critical temperature

-82.1℃

Critical pressure

4640kPa

Critical density

162.5kg/m3

Compression factor

Temperature(℃)/Pressure atm

1 atm 10 atm 100 atm

25℃

0.9982 0.9814 0.895

50℃

0.9988 0.9869 0.929

Heat of fusion (-182.5℃)

58.42kJ/kg

Heat of vaporization 111.66k)

135.65kJ/kg

Specific heat capacity (100kPa, 290k)

Cp=2215.24J/(kg•K)

Specific heat ratio (gas, 26.8℃. 101.325kPa)

Cp/Cv=1.305

Vapor pressure (-180℃)

16.2kPa

(-140℃)

437kPa

(-110℃)

2620kPa

Viscosity (100kPa, 270k)

0.01018mPa • S

Surface tension (90℃)

18.887mN/m

Thermal conductivity (100kPa, 270k )

0.0030019W/(m•K)

Refractive index (gas, 0℃, 101.325kPa)

N=1.000444

Flammable range in air (20℃, 101.325kPa)

5%~15%

Lowest ignition point in air (101.325kPa)

580℃

Flame temperature during equivalent combustion in air

1957℃

Maximum flame speed during equivalent combustion in air

0.4m/s

Flammable range in oxygen (20℃, 101.325kPa)

5%~60%

The lowest ignition point in oxygen (101.325kPa)

555℃

Flame temperature when burning equivalent in oxygen

2810℃

Maximum flame speed during equivalent combustion in oxygen

3.90m/s

Heat of combustion in oxygen

High-39873.52KJ/m3 Low-35856.88KJ/m3

Flash point

-188℃

Most flammable concentration in air

7.8%

The concentration that produces the maximum explosion pressure

9.8%

Maximum explosion pressure

7.17kg/cm3

Minimum ignition energy

0.28mj


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