| | Butane | Propane | Max Power
Propylene | | Flame Temperature in Oxygen (ºF) | 4,925 | 4,579 | 5,193 | | Flame Temperature in Air (ºF) | 3,200 | 3,450 | 3,600 | | Burning Velocity in Oxygen (Ft/Sec) | 11.0 | 12.2 | 15.0 | | Total Heating Value (BTU/CuFt) | 3,374 | 2,498 | 2,371 | | Primary Combustion Heating Value (BTU/CuFt) | 315 | 255 | 433 | | Secondary Combustion Heating Value (BTU/CuFt) | 3,114 | 2,243 | 1,938 | | Total Heating Value After Vaporization (BTU/lb) | 21,500 | 21,800 | 21,100 | | Auto Ignition Temperature (ºF) | 860 | 874 | 927 | | Volume to Weight Ratio (CuFt/lb) | 6.40 | 8.66 | 8.25 | | Specific Gravity of Gas in Air | 2.076 | 1.520 | 1.480 | | Specific Gravity of Gas in Liquid | 0.579 | 0.507 | 0.522 | | Pounds Per Gallon | 4.70 | 4.24 | 4.35 | | Oxygen Required, Neutral Flame (CuFt/Ft Fuel) | N/A | 4.3 | 3.5 | | Explosive Limits in Air (%) | 1.9-8.5 | 2.2-9.5 | 2.0-11.0 | | Toxicity | Low | Low | Low | | Shock Sensitivity | Stable | Stable | Stable | | Tendency to Backfire | Slight | Slight | Slight | | Reactions to Backfire | Few
Restrictions | Few
Restrictions | Few
Restrictions | | Vapor Pressure @70ºF | 30 | 125 | 140 |
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