By Little Pro on 2016-01-13 Views: Update:2018-02-09
Flash point is the lowest temperature at which a chemical can vaporize to form an ignitable mixture in air. A lower flash point indicates higher flammability. Measuring a flash point (open-cup or close-cup) requires an ignition source. At the flash point, the vapor may cease to burn when the ignition source is removed. You can often find it in the section 9 of a safety data sheet (SDS).
It shall be note that flash point is different from auto-ignition temperature at which a chemical can burn without an ignition source.
Flash point is mainly used to distinguish flammable liquids from combustible liquids and non-flammable liquids. The picture below is an example of GHS classification criteria for flammable liquids. A liquid with a flash point between 23 and 60 Celsius degrees will be classified as flammable liquid category 3. A liquid with a flash point above 93 Celsius degrees does not meet GHS classification criteria and will not be regarded as a flammable liquid or a hazardous chemical.
Under dangerous goods regulations, a liquid with a flash point below 60 Celsius degrees will be classified as Class 3 Dangerous Goods FLAMMABLE LIQUIDS. Materials with flash points below 100 °F (38 °C) are regulated in the United States by OSHA as potential workplace hazards.
Under REACH, a flash point test does not need to be conducted if: