This Technical Specification is applicable to determine the acid and/or base neutralization capacity of a material. The property is expressed in mol/kg. This Technical Specification is a parameter specific test as specified in EN 12920. The application of this test method alone is not sufficient for the determination of the detailed leaching behaviour of a waste under specified conditions. The property allows assessing the final pH of mixed waste as well as consequences of external influences (carbonation, oxidation) on the pH of a waste. NOTE: This generally requires the application of several test methods, behavioral modeling and model validation as specified in EN 12920.