Artists Resource for Fire

Fire Information

Gas Comparison Chart

This is an interesting table which shows some characteristics of different gas flames as they come out of a torch.

This chart compares the flames you would find coming out of a standard hand-held torch.

  Butane Propane MAPP Acetylene
Flame Temperature in Air (�F) 3,200 3,450 3,650 4,350
Total Heating Value (BTU/CuFt) 3,374 2,498 2,406 1,470
Primary Combustion Heating Value (BTU/CuFt) 315 255 517 507
Specific Gravity of Gas in Air 2.076 1.52 1.48 0.906
Pounds Per Gallon 4.7 4.24 4.8 N/A
Explosive Limits in Air (%) 1.9 - 8.5 2.2 - 9.5 3.4 - 10.8 2.5 - 80.00
Toxicity Low Low Low Low
Shock Sensitivity Stable Stable Stable Unstable
Tendency to Backfire Slight Slight Slight to Moderate Considerable
Vapor Pressure @ 70�F 30 125 120 250
Reactions to Backfire Few Restrictions Few Restrictions Avoid unalloyed Silver, Alloys containing more than 67% Copper & Magnesium Avoid alloys with more than 67% Copper
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The information on this Web site is for informational pourposes only. Nothing should be attempted without first consulting your local Fire Marshal or the Authority Having Jurisdiction (AHJ) in your area. Some of the activities described may be illegal in your area and in no way should you attempt any activity without the expressed consent of the AHJ.