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:
Table 30.10-27--Equivalent Flashpoints
[In degrees Fahrenheit]------------------------------------------------------------------------
Pensky-Martens
Open-cup tester Tag closed-cup closed tester
tester (A.S.T.M.) (A.S.T.M.)------------------------------------------------------------------------80................................ 75 .................150............................... ................. 140------------------------------------------------------------------------ [CGFR 65-50, 30 FR 16657, Dec. 30, 1965, as amended by USCG-2014-0688, 79 FR 58279, Sept. 29, 2014]