- Joined
- Sunday September 6, 2009
I'm not sure the flash point is all important; I think that is just the temp at which the essential/fragrance oil would literally ignite? Even a concentrated perfume will evaporate gradually at skin temp - say 33C. I presume any temp higher then that will accelerate the process.
I got this definition of flash point from a soapy site
'Every flammable liquid has a vapor pressure, which is a function of that liquid's temperature. As the temperature increases, the vapor pressure increases. As the vapor pressure increases, the concentration of evaporated flammable liquid in the air increases. Hence it is the temperature which determines the concentration of evaporated flammable liquid in the air under equilibrium conditions. Different flammable liquids require different concentrations of the fuel to be present in the air to sustain combustion. The flash point is that minimum temperature at which there is enough evaporated fuel in the air to start combustion.
The fire point of a liquid is the temperature at which it will continue to burn after ignition for at least 5 seconds. At the flash point, a lower temperature, a substance will ignite, but vapor might not be produced at a rate to sustain the fire. '
I got this definition of flash point from a soapy site
'Every flammable liquid has a vapor pressure, which is a function of that liquid's temperature. As the temperature increases, the vapor pressure increases. As the vapor pressure increases, the concentration of evaporated flammable liquid in the air increases. Hence it is the temperature which determines the concentration of evaporated flammable liquid in the air under equilibrium conditions. Different flammable liquids require different concentrations of the fuel to be present in the air to sustain combustion. The flash point is that minimum temperature at which there is enough evaporated fuel in the air to start combustion.
The fire point of a liquid is the temperature at which it will continue to burn after ignition for at least 5 seconds. At the flash point, a lower temperature, a substance will ignite, but vapor might not be produced at a rate to sustain the fire. '