What is the flash point of waste engine oil?

2 Answers
LeZane
08/26/25 3:21am
Waste engine oil has a flash point of 200 degrees Celsius. Definition of flash point: Flash point refers to the minimum temperature at which a gas, liquid, or solid combustible material, when coexisting with air, will spontaneously ignite upon contact with an ignition source. After the ignition source is removed, the material continues to burn at this minimum temperature, which is known as the flash point or ignition point of the substance. Methods for handling waste engine oil: Qualified waste engine oil treatment companies can process waste engine oil through regeneration. This involves using methods such as sedimentation, distillation, acid washing, alkali washing, and filtration to remove impurities from the oil. These impurities are toxic substances and are classified as solid hazardous waste under national standards.
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LeAnastasia
09/08/25 3:49am
I've seen plenty of waste engine oil left after vehicle maintenance, and its flash point isn't fixed—usually between 150°C and 300°C. I've tested used oil with a tester; freshly drained oil typically approaches 200°C, but if mixed with gasoline or impurities, it can drop below 150°C, making it prone to ignition from even a tiny spark. I remember one close call at the shop when an apprentice carelessly spilled oil onto a hot exhaust pipe, causing smoke—luckily, no fire started. Always dispose of it properly at recycling points; never dump it into drains for convenience, especially in hot weather when it's even more hazardous. Store waste oil containers in a cool place with lids tightly sealed to prevent vapor buildup—safety first!
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