material particles less than 100 um are considered nano.

来源: 于 2012-09-08 08:34:46 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

Don't buy any aerosol products that contain nano materials.Particles that small are respirable. It travels to our deep lung and stays there. Some will travel to brain. Sometime nano is a bad news.