When a Pyrex bowl is heated or cooled rapidly, different parts of the bowl expand or contract by different amounts, causing stress. If the stress is too extreme, the bowls structure will fail, causing a spectacular shattering effect.

Why did my Pyrex dish crack?

If there are any cracks in the outside of the dish, such as scratches or damage built up over many heat/cool cycles, this crack can travel through the dish and the tension in the surface can be released as a great big crack, and the plate will split.

At what temperature will Pyrex shatter?

Is Pyrex glassware susceptible to shattering? Shattering is relatively rare, but it can happen when glassware is exposed to sudden temperature changes (known as thermal shock), extremely high heat (over 425 degrees), or direct heat.

Can you put boiling water in Pyrex?

Even heat-resistant glasses like Pyrex can shatter when poured with boiling water incorrectly. To prevent the glass from cracking when exposed to boiling water, you should avoid extreme and abrupt changes in temperature.

Can I cook Pyrex at 425?

Pyrex cookware is meant to withstand baking, but it cannot be trusted for use over 425 degrees. This means that for recipes requiring higher temps you should use metal pans. If you use modern Pyrex on a direct heat source, the result will likely be a cracked or exploded piece of glassware.

Can you microwave water in pyrex?

Is it safe to microwave Pyrex? According to the manufacturer, Pyrex dishes are microwave-safe. However, the company advises not to shock the glass by putting in water or on cold surfaces immediately after heating.

Can you pour hot water into glass?

When you pour hot water into a glass (which is at room temperature), the inner layer of the glass will absorb heat. When a material absorbs heat, it expands. Glass is no exception to that. If the water is really hot, the glass will definitely crack.

Can you freeze a lasagna in a glass dish?

If you plan on freezing lasagna, it is best to prepare it in a dish that is safe for the freezer and the oven, making for an easy meal. Glass and ceramic baking dishes are both good options. Many people like to prepare two lasagnas at the same time, and freeze one to enjoy later.

Can you cook Pyrex at 450?

Pyrex is meant to be able to withstand higher temperatures. But everything has its limitations. Pyrex can be used safely inside an oven that is less than 450 degrees F. Whether or not its inside a conventional oven or a convection oven, this glassware will be safe to use so long as that temperature isnt exceeded.