1. (a) A solid waste exhibits the characteristic of ignitability if a representative sample of the waste has any of the properties listed in Subsections R315-261-21(a)(1) through R315-261-21(a)(4):
2. (1) It is a liquid, other than a solution containing less than 24% alcohol by volume and at least 50% water by weight, that has a flash point less than 60 degrees C, that is140 degrees F, as determined by using one of the following ASTM Standards: ASTM D 93-79, D 93-80, ASTM D 3278-78, D8174-18, or D8175-18 as specified in SW-846 Test Methods 1010B or 1020C, which are incorporated by reference, see Section R315-260-11.
3. (2) It is not a liquid and is capable, under standard temperature and pressure, of causing fire through friction, absorption of moisture or spontaneous chemical changes and, if ignited, burns so vigorously and persistently that it creates a hazard.

4. (3) It is an ignitable compressed gas.

   1. (i) The term "compressed gas" shall designate any material or mixture having in the container an absolute pressure exceeding 40 p.s.i. at 70 degrees Fahrenheit or, regardless of the pressure at 70 degrees Fahrenheit, having an absolute pressure exceeding 104 p.s.i. at 130 degrees Fahrenheit, or any liquid flammable material having a vapor pressure exceeding 40 p.s.i. absolute at 100 degrees Fahrenheit as determined by ASTM Test D-323.

      1. (ii) A compressed gas shall be characterized as ignitable if any one of the conditions listed in Subsection R315-261-21(a)(3)(ii)(A) or R315-261-21(a)(3)(ii)(B) occurs:

         1. (A) Either a mixture of 13% or less, by volume, with air forms a flammable mixture or the flammable range with air is wider than 12% regardless of the lower limit. These limits shall be determined at atmospheric temperature and pressure. The

            method of sampling and test procedure shall be the ASTM E681-85, incorporated by reference, see Section R315-260-11, or other equivalent methods approved by the Associate Administrator, Pipeline and Hazardous Materials Safety Administration, U.S. Department of Transportation.

         2. (B) It is determined to be flammable or extremely flammable using 49 CFR 173.115(l).

5. (4) It is an oxidizer. An oxidizer for Section R315-261-21 is a substance such as a chlorate, permanganate, inorganic peroxide, or a nitrate, that yields oxygen readily to stimulate the combustion of organic matter.

   1. (i) An organic compound containing the bivalent -O-O- structure and that may be considered a derivative of hydrogen peroxide where one or more of the hydrogen atoms have been replaced by organic radicals shall be classed as an organic peroxide unless:

      1. (A) the material meets the definition of a Division 1.1, 1.2, or 1.3 explosive, as defined in Subsection R315-261-23(a)(8), in which case it shall be classed as an explosive;
      2. (B) the material is forbidden to be offered for transportation according to 49 CFR 172.101 and 49 CFR 173.21;
      3. (C) it is determined that the predominant hazard of the material containing an organic peroxide is other than that of an organic peroxide; or
      4. (D) according to data on file with the Pipeline and Hazardous Materials Safety Administration in the U.S. Department of Transportation, it has been determined that the material does not present a hazard in transportation.
   2. (b) A solid waste that exhibits the characteristic of ignitability has the EPA Hazardous Waste Number of D001.

KEY: hazardous waste

Date of Last Change: November 17, 2025

Notice of Continuation: December 11, 2025

Authorizing, and Implemented or Interpreted Law: 19-6-105; 19-6-106