I tried finding the answer online, but I couldn't find anything. Here it is:

Describe the process of testing containers to see if they are microwave oven safe.

Thanks!!!

http://www.foodproductdesign.com/articles/462/462_0695ap.html

http://www.cookingforengineers.com/article.php?id=99

http://www.ferret.com.au/articles/71/0c024c71.asp

Thanks!