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zhangwj(½ð±Ò+2): thanks 2011-10-21 15:36:57
lchpy(½ð±Ò+1): thanks for your information 2011-10-21 15:37:08
"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,
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replaced by a threshold between 1 and 50 %.

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