Every measure has been taken to make sure that your product is safe to put in the microwave or run through the dishwasher.  It will be hot when it comes out of the microwave.  Please take precautions so that you don't get burned.  Most people find that if you handwash your handmade items they last longer, however, I dishwasher mine all the time.  I find that most of the time they break when they are either being dropped or something is being dropped on them.