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On 18 October 2011 the EU Commission adopted the recommendation on the definition of a nanomaterial. According to this recommendation a ‘nanomaterial’ means: A natural incidental or manufactured material containing particles in an unbound state or as an aggregate or as an agglomerate and where for 50% or more of the particles in the number size distribution one or more external dimensions is in the size range 1 nm – 100 nm. In specific cases and where warranted by concerns for the environment health safety or competitiveness the number size distribution threshold of 50% may be replaced by a threshold between 1 and 50%. By derogation from the above fullerenes graphene flakes and single wall carbon nanotubes with one or more external dimensions below 1 nm should be considered as nanomaterials.

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