[Code of Federal Regulations] [Title 40, Volume 18, Parts 260 to 265] [Revised as of July 1, 2000] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR261.23] [Page 55] TITLE 40--PROTECTION OF ENVIRONMENT PART 261--IDENTIFICATION AND LISTING OF HAZARDOUS WASTE--Table of Contents Subpart C--Characteristics of Hazardous Waste Sec. 261.23 Characteristic of reactivity. (a) A solid waste exhibits the characteristic of reactivity if a representative sample of the waste has any of the following properties: (1) It is normally unstable and readily undergoes violent change without detonating. (2) It reacts violently with water. (3) It forms potentially explosive mixtures with water. (4) When mixed with water, it generates toxic gases, vapors or fumes in a quantity sufficient to present a danger to human health or the environment. (5) It is a cyanide or sulfide bearing waste which, when exposed to pH conditions between 2 and 12.5, can generate toxic gases, vapors or fumes in a quantity sufficient to present a danger to human health or the environment. (6) It is capable of detonation or explosive reaction if it is subjected to a strong initiating source or if heated under confinement. (7) It is readily capable of detonation or explosive decomposition or reaction at standard temperature and pressure. (8) It is a forbidden explosive as defined in 49 CFR 173.51, or a Class A explosive as defined in 49 CFR 173.53 or a Class B explosive as defined in 49 CFR 173.88. (b) A solid waste that exhibits the characteristic of reactivity has the EPA Hazardous Waste Number of D003. [45 FR 33119, May 19, 1980, as amended at 55 FR 22684, June 1, 1990]