Allan,

Caution is a good thing, but this one isn't too deadly.

It is a wax ring. Melting and pouring it into containers is just like making candles. Millions of kids make candles without extensive safety precautions. Like any hot liquid, it can burn if you pour some on your skin, but not really more dangerous than normal cooking.

Melts around 140 F and flashpoint over 450 F. If you manage to accidentally set it on fire, it will burn like a candle.

Here's an MSDS for a toilet bowl ring:
[url=http://www.herchem.com/msds/MSDS68_johniring.pdf:5dea7]http://www.herchem.com/msds/MSDS68_johniring.pdf[/url:5dea7]