Cetane Rating Law and Legal Definition
According to 15 USCS § 2821 [Title 15. Commerce and Trade; Chapter 55. Petroleum Marketing Practices; Octane Disclosure], the term "cetane rating" means “
(A) a measure, as indicated by a cetane index or cetane number, of the ignition quality of diesel fuel oil and of the influence of the diesel fuel oil on combustion roughness.
(B) The term "cetane index" and the term "cetane number" have the meanings determined in accordance with the test methods set forth in the American Society for Testing and Materials standard test methods--
(i) designated D976 or D4737 in the case of cetane index; and
(ii) designated D613 in the case of cetane number, (as in effect on the date of the enactment of this Act) and shall apply to any grade or type of diesel fuel oils defined in the specification of the American Society for Testing and Materials entitled "Standard Specification for Diesel Fuel Oils" designated D975 (as in effect on such date).”
