What is a nanomaterial?

What is a nanomaterial? Since October of the last year European Union gave us the definition:

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.

More info here:

http://ec.europa.eu/environment/chemicals/nanotech/index.htm

The full FAQ can be found here:

http://europa.eu/rapid/pressReleasesAction.do?reference=MEMO/11/704&format=HTML&aged=0&language=EN&guiLanguage=en

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