Yes, Pyrex is oven-safe up to 425∘F 425∘F (or up to 450∘F 450∘F for some pans), provided you follow strict safety guidelines to prevent "thermal shock," which can cause the glass to shatter. Always verify the dish is clearly marked as oven-safe.
Check the bottom of your dish for the official Pyrex logo and safety icons. Genuine Pyrex bakeware is oven-safe up to 425∘F425 raised to the composed with power cap F425∘𝐹 (or 450∘F450 raised to the composed with power cap F450∘𝐹 for specific baking pieces), provided it has the logo in all-uppercase letters and features an outline of an oven among its usage symbols.
Soda-lime glass is cheaper but doesn't have the same thermal shock-resistant properties of borosilicate glass. That's why so many people report their Pyrex exploding in the oven or due to extreme temperature changes (for example, placing a very hot dish on a colder surface).
As long as you follow the same guidelines above, vintage Pyrex is A-OK to go in the oven and can be used in oven temperatures up to 425ºF (and skip the broiler). There is one caveat to using your vintage Pyrex, though: Do not use any vintage dishes that are chipped or cracked—in the oven or otherwise.
Yes, Pyrex is perfectly oven-safe at 350°F (and up to 425°F for most dishes). However, to prevent thermal shock and avoid shattering the glass, you must follow a few specific safety precautions.
Lower case pyrex is made of a less expensive glass called soda-lime and is less heat resistant. It can only handle oven temps up to 425°F. Anything higher and you find your meal coating the walls of your oven. Uneven heating of the glass or sudden temperatures changes can cause the pyrex glass to shatter.
Pyrex explosions are almost always caused by thermal shock—a sudden, extreme temperature change that forces the glass to expand or contract too quickly. Glass is brittle, and uneven temperatures cause stress that shatters the dish.
While the glass is designed for temperatures typically used in baking, it can break when exposed to the direct heating element while the oven is preheating. Failure to follow the safeguards and instructions may result in personal injury and/or property damage.
No, it is not safe to use Pyrex at 500°F.
PYREX® COOKWARE USE & CARE
Pans and lids oven safe up to 450°F.
To tell if a glass dish is oven safe, check the bottom for an "Oven Safe" stamp or a symbol of an oven with wavy lines. If there are no markings, assume it is not oven safe. Standard drinking glasses, thin glass, and unmarked storage containers can shatter from the heat.
Yes, there are two distinct variations of Pyrex. The difference depends on the capitalization of the logo and where the product was manufactured. They use different materials and handle temperature changes differently:
The recommended maximum temperature limit for modern Pyrex glass bakeware is 425°F (218°C). While some extreme-duty borosilicate lines (typically sold internationally) claim limits up to 500°F (260°C) or more, sticking to 425°F or below prevents dangerous "thermal shock".
Here is how to tell the difference. PYREX (uppercase letters) = cookware that is made of borosilicate glass and can be heated in a microwave or oven pyrex (lowercase letters) = indication of containers that should not be heated in the oven or microwave.
Since PYREX is made with borosilicate glass, it is more heat-resistant and therefore less prone to breaking due to any sudden changes of temperature such as transferring a casserole from the refrigerator directly to the oven.
No, they mean different things. "No broiler" means you can use the Pyrex dish in a standard preheated oven, but you must keep it away from the intense, direct heat of the broiler and off the stovetop.
Yes, Pyrex is oven-safe at 400∘F. However, because glass is susceptible to thermal shock, always fully preheat the oven before putting the dish inside, avoid placing it directly on the metal oven rack, and never add cold liquids to a hot dish.
A Pyrex pan can absolutely go from the fridge to a 350° oven. I make so many recipes that chill overnight in the pan before going into a preheated oven.
You can put Pyrex in the oven up to 425ºF.
However, you must avoid what experts call “thermal shock” when cooking or baking with it. Thermal shock happens when glassware is exposed to drastic temperature changes it can't handle.
Yes, Pyrex can break or shatter in the oven due to "thermal shock," which happens when the glass experiences a rapid temperature change. Modern Pyrex is made of tempered soda-lime glass, meaning extreme, sudden shifts in temperature will cause the glass to stress and shatter.
The primary difference is the glass material: vintage Pyrex is made of highly heat-resistant borosilicate glass, while modern Pyrex is made of tempered soda-lime glass. This formulation change makes old Pyrex significantly more durable against extreme temperature changes (thermal shock), while new Pyrex is more prone to shattering if handled improperly.
Check the bottom or side of your dish for a stamped symbol. An oven-safe Pyrex item will have a small picture of an oven, often accompanied by text specifying it is safe for preheated ovens (typically up to 425∘F425 raised to the composed with power F425∘F). If the oven symbol has an X over it, the dish is not oven safe.
Discard any Pyrex dish immediately if it has chips, cracks, or deep, localized scratches, as these compromise the structural integrity and can cause the glass to shatter under heat. Additionally, throw away very old, chipped vintage Pyrex (which can leach lead) or heavily etched items.
To prevent Pyrex from shattering, avoid exposing the glass to rapid temperature changes, which causes dangerous thermal shock. Most modern Pyrex is made of soda-lime glass rather than traditional borosilicate, meaning it cannot handle extreme fluctuations.
Modern Pyrex isn’t as durable because the manufacturer switched the material from highly heat-resistant borosilicate glass to soda-lime glass. This change makes the bakeware much more susceptible to shattering from "thermal shock" (e.g., placing a hot dish on a cold counter).