- Lower Explosive Limit (LEL) of 4% (40,000ppm)
- Leanest mixture that still sustains a flame
- Upper Explosive Limit (UEL) of 44%
- The richest flammable mixture
- Can pose a risk with the use of some entry tools
- Flammability and explosive potential must be a constant consideration and air sampling should be a continuous process [15]
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