Originally Posted by illinois

This method is 100% safe. It's what I use, too. It also protects the pad from any possible boil overs and will probably hold up better over time. A friend of mine says these are wonderful for use for a bowl of ice cream, as well!

Interesting enough--I have 2 small Pyrex style casserole dishes that I've used for years in my microwaves. There is some sort of design on the side that only recently began to spark when in the microwave. Sadly, they are in good condition and have nice lids that they were used often. Guess not now, huh?