NFPA defines a combustible liquid as having a flash point of at least what when tested by closed-cup methods?

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Multiple Choice

NFPA defines a combustible liquid as having a flash point of at least what when tested by closed-cup methods?

Explanation:
Flash point is the lowest temperature at which a liquid’s vapors can form an ignitable mixture with air. When this test is done with a closed-cup method, the NFPA classifies a liquid as combustible if the flash point is 100°F (37.8°C) or higher. The closed-cup approach traps vapors, which tends to produce a higher flash point reading than open-cup tests, so 100°F or above is the threshold used for this classification.

Flash point is the lowest temperature at which a liquid’s vapors can form an ignitable mixture with air. When this test is done with a closed-cup method, the NFPA classifies a liquid as combustible if the flash point is 100°F (37.8°C) or higher. The closed-cup approach traps vapors, which tends to produce a higher flash point reading than open-cup tests, so 100°F or above is the threshold used for this classification.

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