Gas Comparison ChartThis 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.
|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|
|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|