Subject nano-silica

On 5 November 2008, the EPA announced that it was promulgating SNUR under the TSCA for two nanomaterials, siloxane-modified silica nanoparticles and siloxane-modified alumina nanoparticles, that were subject to PMN [15]. It is likely that PMN were required for these substances because they were new substances in the traditional sense and not because they were nano-sized versions of existing chemicals. 

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