What is the flashpoint for substances classified as 'Danger Extremely Flammable'?

• A. <-70°C
• B. -7°C to 0°C
• C. 0°C
• D. <-7°C

Answer: (D)

Flashpoint is the lowest temperature at which a liquid can produce enough vapor to ignite in air. For substances labeled Danger Extremely Flammable in this context, the defining threshold is a flashpoint below -7°C. That means any liquid with a flashpoint colder than -7°C is considered extremely flammable, because it can form ignitable vapors even at quite low ambient temperatures. The other temperature options describe higher flashpoints, which would not meet the criteria for the extremely flammable category. While an even lower figure like -70°C technically also qualifies as below -7°C, the important point is the threshold itself: anything under -7°C falls into this dangerous classification.