Volatile flammable liquid.

Volatile flammable liquid. A flammable liquid having a flash point below 38 C (100 F), or a flammable liquid whose temperature is above its flash point, or a Class II combustible liquid having a vapor pressure not exceeding 276 kPa (40 psia) at 38 C (100 F) and whose temperature is above its flash point.

Source

29 CFR § 1910.399

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Scoping language

Acceptable. An installation or equipment is acceptable to the Assistant Secretary of Labor, and approved within the meaning of this subpart S:

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