Cleveland Open Cup Flash Point Testers find the lowest temperature at which vapor above a heated oil sample ignites when a small flame passes over the surface. The sample sits in an open cup and is heated at a steady rate while a test flame is swept across the cup at set intervals, and the temperature at the first flash is recorded as the flash point, with continued heating giving the fire point. Open cup testing suits heavier petroleum products such as lubricating oils, which flash well above room temperature. A quartz tube heater gives even heating and gas ignition supplies the test flame. Typical uses include lubricant and base oil QC, hazard classification and used oil checks.