Avoid extreme temp changes, hot, cold. Freezer safe. Glass is pre-heated oven & microwave safe. Dishwasher safe. Always preheat oven preheat. Always set hot glassware on dry pot holder or dish towel. Add liquid to cover bottom of dish prior to cooking foods that release liquid. No stovetop no broiler. Safety and usage instructions and warranties. Read these instructions and save them for future reference. Usage instructions: Pyrex glassware can be used for cooking, baking, warming and reheating food in microwave ovens and preheated heated conventional or convection ovens. Pyrex glassware is dishwasher safe. This product is intended for normal household use only.