... 90 years ago and made of a durable, high temperature glass, Pyrex remains the ideal medium for safe, dependable food preparation ... cooking small portions, side dishes and re-heating leftovers Pyrex glass is safe in the oven, microwave, refrigerator, freezer, and ... microwave after lid is removed. Serve in the attractive tempered glass dish. After use, dishwasher clean-up leaves GlassLock ready to ...