~High borosilicate casserole is durable, transparent for easy monitoring of baking progress and provides good heat conduction for even, consistent baking. There's no substitute for borosilicate glass casserole.The glass casserole was made of a durable, high temperature material. Able to withstand temperatures from -40 to 400˚C. High borosilicate glass casserole remains the ideal medium for safe, dependable food preparation .