jup, just don't handling it sucks (it gets everywhere and itches if it penetrates your skin. construction workers often don't seem to give much of a * though...)

I used to work with ceramic wool and in big letters on the box it says that it's known to be a possible carcinogen. Not only does it kill you slowly, it hurts more than itches unlike regular insulation. The fibers are longer and sharper and really sting and take a few freezing cold showers to really get it out of your skin. I certainly don't miss those days :)