OECD Guidelines for the Testing of Chemicals, Section 3, OECD Publishing, Paris. 32 pp, 2017

Dispersion stability of nanomaterials is an important parameter affecting nanomaterial environmental behavior. This parameter depends on the physicochemical characteristics of the nanomaterial itself, the physicochemical characteristics of the suspension medium, suspension preparation, concentration of the nanomaterial, and concentration of other substances and particles in the suspension. This guideline describes a test procedure to gain information on dispersion stability of manufactured nanomaterials in simulated environmental media. Based on the results it is possible to categorize tested nanomaterials into three different classes according to their dispersion stability in tested aqueous media, i.e., as nanomaterials of low dispersion stability or high dispersion stability under given conditions, and as nanomaterials with condition-depending dispersion stabilities. http://dx.doi.org/10.1787/9789264284142-en