Is there a maximum safe temperature for cooking with a glass casserole dish in an oven?  Got some Dutch ovens on the bottom rack at 240C (450F) and wondering if I dare put a Pyrex dish on the top rack for half an hour... 
According to this page     The Pyrex heat capacity is truly impressive as the glass can withstand temperatures up to 932 degrees Fahrenheit   or 500°C  Beware, however     Pyrex will tolerate both hot and cold, but it can't do both at the same time. Pyrex can go from the freezer or fridge to the oven, but the trip needs to be a long one. Sudden changes in temperature can shatter any glass, including Pyrex   This Pyrex beaker has a temperature tolerance of 490°C, for instance. 