Flash and Fire

The flash point of an ignitable liquid is the lowest temperature at which the liquid can form an ignitable mixture in air. At the flash point, the vapor will cease burning when the ignition mechanism is removed. At a slightly higher temperature, the fire point is defined as the temperature at which the vapor continues to burn after being ignited. This test is important because every ignitable liquid has a unique vapor pressure, which is a function of that liquid's temperature. As the temperature increases, the vapor pressure increases. This leads to an increased concentration of evaporated ignitable vapors in the immediate region of the ignitable liquid surface. Once the appropriate fuel/air ratio is attained, a viable ignition mechanism can flash the vapors or lead to a sustained flame.

These tests are typically conducted in either a sealed or open system. WHA commonly performs standardized tests such as the Cleveland Open Cup ASTM D92-05a Test as well as many specialized tests designed to answer specific client inquiries.