46 CFR §30.10-27
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The term flashpoint indicates the temperature in degrees Fahrenheit at which a liquid gives off a flammable vapor when heated in an open-cup tester. For the purpose of the regulations in this subchapter, flashpoints determined by other testing methods will be equivalent to those determined with an open-cup tester, as follows: