Hello, I'm Dr. Emily Thompson, a materials scientist specializing in glass properties and applications. I can definitely address your question about putting glass in the oven.

The simple answer is: it depends.

While it's true that some glass is oven-safe, not all glass is created equal. The key factor determining whether a glass container can withstand the heat of an oven lies in its composition and manufacturing process.

Let's break down the reasons why some glass is oven-safe while others are not:

1. Composition:

* Borosilicate glass: This type of glass, commonly known as Pyrex or borosilicate glass, has a higher thermal shock resistance compared to ordinary soda-lime glass. It's made by adding boron oxide to the traditional glass recipe, which significantly increases its ability to withstand temperature fluctuations. This makes borosilicate glass ideal for oven use and microwave heating.
* Soda-lime glass: This is the most common type of glass used for everyday items like drinking glasses, windows, and food jars. It has a lower thermal shock resistance and is more prone to cracking or breaking when subjected to rapid temperature changes. This type of glass is not recommended for oven use.

2. Manufacturing Process:

* Tempered glass: This type of glass undergoes a heat treatment process that strengthens it. While tempered glass is more resistant to breakage than regular glass, it can still crack under extreme temperature changes. Some tempered glass items are labeled "oven-safe", but it's crucial to follow the manufacturer's instructions regarding temperature limits.
* Annealed glass: This is the most basic type of glass, which is not specifically treated for heat resistance. It's not suitable for oven use due to its vulnerability to cracking under heat.

3. Shape and Thickness:

* Thin glass: Thin glass is more susceptible to thermal shock because it heats and cools more quickly, creating uneven stress on the material.
* Thick glass: Thick glass generally offers better thermal shock resistance because it can distribute heat more evenly. However, even thick glass can crack if it is exposed to extreme temperature changes.

4. Specific Applications:

* Baking dishes: Baking dishes are typically made of borosilicate glass or tempered glass and are specifically designed for oven use. However, it's essential to check the manufacturer's instructions for temperature limits.
* Glass jars: Most glass jars are made of soda-lime glass and are not designed for oven use. They can shatter when exposed to high heat.
* Drinking glasses: Drinking glasses are typically made of soda-lime glass and are not oven-safe.

To summarize:

* Borosilicate glass (Pyrex, borosilicate glass) is generally oven-safe, but it's always best to check the manufacturer's instructions.
* Soda-lime glass is not oven-safe.
* Tempered glass can be oven-safe if labeled as such, but it's essential to follow the manufacturer's instructions.
* Annealed glass is not oven-safe.

Important Considerations:

* **Always check the manufacturer's instructions:** This is the most important factor to determine whether your glass is oven-safe.
* Never place cold glass in a hot oven: This can cause the glass to crack or shatter due to thermal shock.
* Preheat your oven: This allows the glass to warm up slowly and minimizes the risk of thermal shock.
* Avoid extreme temperature changes: Sudden temperature changes can stress the glass and lead to cracking or breakage.

Remember, safety is paramount! If you're unsure about the oven-safety of your glass, it's always best to err on the side of caution and avoid using it in the oven.

I hope this information helps you make informed decisions about using glass in your kitchen!
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You can put glass that been designed or engineered to withstand high heat in the oven. I wouldn't put a salad bowl in an oven, but I own several Pyrex glass baking dishes that are meant to be put in the oven.read more >>