Hello, I'm an expert in materials science with a focus on kitchenware. When it comes to Pyrex, it's a type of glass that's known for its durability and thermal resistance.

Pyrex bowls are indeed heat proof, which means they can withstand high temperatures without breaking or shattering. This is one of the reasons why Pyrex is a popular choice for baking dishes, measuring cups, and mixing bowls. It can go from the freezer to the oven without the risk of cracking, and it's also resistant to thermal shock, which is when a material is exposed to a sudden change in temperature.

However, while Pyrex is heat resistant, it's not indestructible. It can still break if dropped or if it's subjected to extreme temperature changes too quickly. For example, placing a very hot Pyrex bowl under cold running water could cause it to crack. Also, it's important to note that while Pyrex can handle high temperatures, it's not designed for direct heat sources like a stovetop.

In summary, Pyrex bowls are heat proof and can be used in various high-temperature applications, but they should be handled with care to avoid breakage.

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Cooking for Engineers says, "Pyrex glassware is an excellent example of microwave safe, heat resistant glass that can also be baked."read more >>