The difference lies in the flash point: the lowest temperature at which a liquid gives off enough vapour to ignite. The Code on well-being at work calls a liquid with a flash point below 21 °C highly flammable (such as acetone or ethanol), between 21 and 55 °C flammable (such as white spirit) and between 55 and 100 °C combustible (such as diesel). Petrol and ether are extremely flammable.
The flash point of your product is in section 9 of the safety data sheet. An overview with examples is in our guide to the storage of hazardous substances.
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