Hello! I'm Dr. Cook, a chemist specializing in materials science and their applications. While I'm not a culinary expert, I can provide you with some insights into the properties of Pyrex and how they relate to microwave use.

Pyrex, a brand of borosilicate glass, is known for its exceptional thermal shock resistance and chemical inertness. This makes it a popular choice for cooking and baking, as it can withstand high temperatures without breaking easily.

However, microwaving Pyrex is not always safe. Here's a breakdown:

Pyrex Bowls:

* Older Pyrex bowls (pre-1998): These were made with a specific formula of borosilicate glass that was microwave-safe. They could be safely heated in a microwave oven.
* Newer Pyrex bowls (post-1998): These are often made with a different glass composition, sometimes including tempered glass for added durability. Tempered glass is not microwave-safe because the rapid heating and cooling cycles can cause it to shatter.

Important Considerations:

* **Look for the "microwave safe" label:** Always check the bottom of your Pyrex bowl for a "microwave safe" label. This indicates that the specific bowl is safe for microwave use.
* Avoid metal trim: If your Pyrex bowl has any metal trim or decoration, do not microwave it. Metal can cause sparks and potentially damage your microwave.
* Check for cracks or chips: Never microwave a Pyrex bowl that is cracked or chipped, as this can weaken the glass and increase the risk of breakage.

The Bottom Line:

While Pyrex is known for its heat resistance, it's crucial to verify whether your specific bowl is microwave-safe. Check for a "microwave safe" label or research the manufacturing date to determine if it's made with a microwave-safe formula. If you're unsure, it's always best to err on the side of caution and avoid microwaving it.

Remember, safety should always be your top priority!

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Pyrex glassware is conventional oven safe and microwave safe based on the Pyrex website but you don't want to shock the glass by placing it in water after it's become heated either. ... I especially love the Vintage Pyrex bowls.read more >>