The flash point and the slightly higher fire point are covered by ASTM D92 and D93. The flash point (typically 225 degrees C or 440 degrees F for mineral oils) is an indication of the safety hazards of a lubricant with respect to fire and explosion.
The flash point is the lowest temperature at which the vapor above the oil sample will momentarily ignite or flash when an ignition source is passed over it. The lab analyst can deploy information about a used oil’s flash point to troubleshoot such problems as thermal failure, gamma radiation, solvent contamination, mixed (or wrong) oils, and antifreeze contamination. Most commonly used as a quick pass/fail test for fuel dilution, more applications have surfaced in recent years. And, because of its low cost, simplicity and versatility, the test is popular among the used oil analysis community as well. Like viscosity, the flash point test has always been a standard part of a lubricant’s specification.
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