C.R.S. § 8-20-202

(1) “Liquid” means any material that has a fluidity greater than that of three hundred penetration asphalt when tested in accordance with ASTM specifications that are found in publication number D 5, “Test for Penetration of Bituminous Materials”. Unless otherwise identified, the term “liquid” shall include both flammable and combustible liquids. (2) “Flammable liquid” or “class I liquid” means a liquid that has a flash point below one hundred degrees Fahrenheit and a vapor pressure not exceeding forty PSIA at one degree Fahrenheit. Class I liquids are subdivided as follows: (a) Class IA liquids have a flash point below seventy-three degrees Fahrenheit and a boiling point below one hundred degrees Fahrenheit. (b) Class IB liquids have a flash point below seventy-three degrees Fahrenheit and a boiling point at or above one hundred degrees Fahrenheit. (c) Class IC liquids have a flash point at or above seventy-three degrees Fahrenheit and below one hundred degrees Fahrenheit. (3) “Combustible liquid” means a liquid that has a flash point at or above one hundred degrees Fahrenheit. Combustible liquids are subdivided as follows: (a) Class II liquids have a flash point at or above one hundred degrees Fahrenheit and below one hundred forty degrees Fahrenheit. (b) Class IIIA liquids have a flash point at or above one hundred forty degrees Fahrenheit and below two hundred degrees Fahrenheit. (c) Class IIIB liquids have a flash point at or above two hundred degrees Fahrenheit.