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Methane (CH4)


A flammable, colorless, and odorless gas. It is shipped as a compressed gas in steel cylinders.

Molecular Weight:

16.04

Safety Data

   

Specific Volume:

24.06 cf/lb@NTP Nontoxic-Simple Asphyxiant Critical Temperature: -115.8 °F

Boiling Point:

-259°F(-161.7°C) @1 atm

 

Critical Pressure: 673.1 psia

CAS No.:

74-82-8

 

 

 

Hazards:

Flammability, Suffocation, High Pressure Flammable Limits: 5-15% in Air

DOT Label:

Red, Flammable Gas

UN Number:

UN 1971

DOT Class:

2.1

 

Cylinder:

Steel Alloy

Cylinder Size
DOT
Specification
Cylinder Dimension
(in.)
Average Tare Weight
(lbs)
Average Internal Volume
(ft3)(L)
Contents
(lbs)

300

3AA2400

9x55

137

1.76  (49.8)

360

200

3AA2265

9x51

119

1.55  (43.9)

300

CH4

>=

99.99% %V
N2

=<

45 ppmv
O2

=<

10 ppmv
H2O

=<

5 ppmv
C2H6

=<

25 ppmv
Other HC

=<

20 ppmv

CH4

>=

99.995% %V
N2

=<

25 ppmv
O2

=<

5 ppmv
H2O

=<

3 ppmv
C2H6

=<

20 ppmv
Other HC

=<

15 ppmv

CH4

>=

99.999% %V
N2

=<

5 ppmv
O2

=<

1 ppmv
H2O

=<

2 ppmv
C2H6

=<

5 ppmv
Other HC

=<

2 ppmv

Additional Information:

Methane is a flammable, colorless, odorless, compressed gas packaged in cylinders under high pressure. It poses an immediate fire and explosion hazard when mixed with air at concentrations exceeding 5.0%. High concentrations that can cause rapid suffocation are within the flammable range and should not be entered.

 
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