The objectives of WP3 are to provide the NANOSOLUTIONS project with a set of stable and well-characterised ENMs relevant
to toxicity testing, and to characterise the stability of ENMs in powder form, in liquid suspension, and in cell media or biological fluids relevant to the time and route of administration to the test organism.

The range of ENMs included in the NANOSOLUTIONS project fulfils a set of criteria that support the overarching goal of NANOSOLUTIONS, namely the provision of a prototype for ENM safety classification. The criteria are primarily that the ENM represent variation in toxicity in support of development of the safety classifier, bearing in mind that surface functionalisations may alter the toxicity of the ENM cores.