StacksVerified U.S. regulatory reference

46 CFR §30.10-22

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The term flammable liquid means any liquid which gives off flammable vapors (as determined by flashpoint from an open-cup tester, as used for test of burning oils) at or below a temperature of 80 °F. Flammable liquids are referred to by grades as follows:
  1. (a)Grade A. Any flammable liquid having a Reid 1 vapor pressure of 14 pounds or more.
  2. (b)Grade B. Any flammable liquid having a Reid 1 vapor pressure under 14 pounds and over 8 1/2 pounds.
  3. (c)Grade C. Any flammable liquid having a Reid 1 vapor pressure of 8 1/2 pounds or less and a flashpoint of 80 °F. or below.