Flash Point
From Roofing, Solar Power, and Spray Foam Insulation Wiki
Flash Point
(1) The lowest temperature of a liquid at which it gives off vapors sufficient to form an ignitable mixture with air near its surface.
(2) The critical temperature at which a material will ignite.
(3) The flash point of a liquid is the lowest temperature of the liquid at which it gives off vapor sufficient to form an ignitable mixture with the air near the surface of the liquid or within the vessel used