Okla. Stat. tit. 25, § 25-36: Definitions

Except as otherwise specifically provided by law, the term

"flammable liquids" shall mean all liquids having a flash point

below seventy degrees Fahrenheit (70 F) as determined in accordance

with the standard method of test for flash point by means of a tag

closed tester (ASTM D56-56) or equivalent test device and having a

vapor pressure not exceeding forty (40) pounds per square inch

absolute at one hundred degrees Fahrenheit (100 F).