If you’re ever in doubt about whether or not your glassware can be put in the oven, always double-check with the manufacturer. They should be able to tell you if their product is safe for high heat and how long it can safely remain in the oven if needed.
Glass is strong and durable, so you may have thought it was also heatproof, but that's not always the case. Glass can crack at very high temperatures due to thermal shock (when sudden changes in temperature cause glass to shatter). In fact, most manufacturers recommend against placing any kind of glassware directly on a stovetop or in an oven unless it has been specifically designed for such use.
The best way to determine if your specific container is safe for cooking is by checking its label or researching the manufacturer's instructions online. If neither source tells you whether or not the container should be used for cooking purposes, err on the side of caution: don't use it!
The glass containers that you use in your kitchen are probably safe to temperatures of at least 350 degrees Fahrenheit, but this isn’t always true.
If you want to put a glass container in the oven, make sure that it is labeled as “oven-safe.” If it doesn’t have this label on it or if you aren't sure about its safety, then don't try using it in the oven.
Glass cookware can be used for cooking foods like soups and stews on low heat (200 degrees Fahrenheit) without any problems. However, if you're going to cook something with high heat (400 degrees Fahrenheit), then make sure that you're using tempered glass cookware instead of regular non-tempered glass cookware. Tempered glass will withstand much higher temperatures than non-tempered ones will because they have been heated and cooled more times during manufacturing process.
Most glass cookware is safe up to temperatures of at least 350 degrees Fahrenheit. However, some glass containers should not be put in an oven or on top of a stove. Drinking glasses are probably the most obvious example: they have been designed so that heat doesn’t affect them and can be used for cold drinks. If you put one in the oven, it could break and get sharp pieces of glass in your food. Another type of container that is unsafe for heating is one that contains liquids with metal lids or metal handles (like a Mason jar). This type of glassware may explode when heated!
Oven-safe glassware is a great way to make your cooking more convenient and fun. The best part about using glass in the oven is that you don’t have to worry about warping or cracking like with metal pans. However, it’s important to understand which types of materials can withstand high temperatures before putting them inside your oven!