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liquid flammable material having a vapor pressure exceeding 40 p.s.i. absolute at 100°F as determined by ASTM Test D-323. (B) A compressed gas shall be characterized as ignitable if any one of the following occurs: 1. Either a mixture of 13 percent or less (by volume) with air forms a flammable mixture or the flammable range with air is wider than 12 percent regardless of the lower limit. These limits shall be determined at atmospheric temperature and pressure. The method of sampling and test procedure shall be acceptable to the Bureau of Explosives and approved by the director, Pipeline and Hazardous Materials Technology, U.S. Department of Transportation (see Note 2) or equivalent test methods approved by the Department pursuant to section 66260.21. 2. Using the Bureau of Explosives' Flame Projection Apparatus (see Note 1), the flame projects more than 18 inches beyond the ignition source with valve opened fully. Or, the flame flashes back and burns at the valve with any degree of valve opening. 3. Using the Bureau of Explosives' Open Drum Apparatus (see Note 1), there is any significant propagation of flame away from the ignition source. 4. Using the Bureau of Explosives' Closed Drum Apparatus (see Note 1), there is any explosion of the vapor-air mixture in the drum. (4) It is an oxidizer. An oxidizer for the purpose of this subchapter is a substance such as a chlorate, permanganate, inorganic peroxide, or a nitrate, that yields oxygen readily to stimulate the combustion of organic matter (see Note 4). (A) An organic compound containing the bivalent -O-O- structure and which may be considered a derivative of hydrogen peroxide where one or more of the hydrogen atoms have been replaced by organic radicals must be classed as an organic peroxide unless: 1. The material meets the definition of a Class A explosive or a Class B explosive, as defined in §66261.23(a)(8), in which case it must be classed as an explosive. 2. The material is forbidden to be offered for transportation according to 49 CFR 172.101 and 49 CFR 173.21. 3. It is determined that the predominant hazard of the material containing an organic peroxide is other than that of an organic peroxide, or 4. According to data on file with the Pipeline and Hazardous Materials Safety Administration in the U.S. Department of Transportation (see Note 3), it has been determined that the material does not present a hazard in transportation. (b) A hazardous waste that exhibits the characteristic of ignitability has the EPA Hazardous Waste Number of D001. Note 1: A description of the Bureau of Explosives' Flame Projection Apparatus, Open Drum Apparatus, Closed Drum Apparatus, and method of tests may be procured from the Bureau of Explosives.