This MSDS for water (http://www.sciencestuff.com/msds/C2959.html ) says
that on contact with water, to "wash exposed area with soap and water".
The MSDS for isopropanol warns to avoid skin contact, yet it is sold as
rubbing alcohol for disinfecting open wounds, and Sigma sells it in
MSDS's purposefully overstate the hazards of a chemical the company
sells to avoid any potential legal action. Chances are, you are not
using silica microspheres in large quantity (they are extremely
expensive, you pay dearly for the nice even spheres). Unless you stick
your nose in the bottle and inhale deeply, it's probably no worse than
breathing in a city for a day. In spring you inhale many millions of
small particles called pollen. Chill out.
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