What maximum flammability percentage is allowed for safety?

The maximum flammability percentage allowed for safety is 10% of the Lower Flammability Limit (LFL). The LFL is the lowest concentration of a flammable substance in the air that can ignite and sustain combustion. Allowing operations at or below 10% of the LFL helps ensure a significant safety margin, minimizing the risk of an ignition source potentially causing an explosion or fire.

Staying within this limit ensures that the atmosphere remains non-flammable while allowing for sufficient ventilation and preventing the accumulation of hazardous concentrations of flammable gases. In various industries and emergency response situations, adhering to this 10% threshold aligns with safety protocols and guidelines designed to protect personnel and equipment from fire hazards.