Can Pyrex Go on the Stovetop? Unveiling the Truth
While some Pyrex cookware is oven-safe, most standard Pyrex should NOT be used directly on a stovetop. Doing so can lead to dangerous shattering due to thermal shock.
The Pyrex Legacy: From Borosilicate to Soda-Lime
Pyrex has been a kitchen staple for over a century, but its composition has evolved. Originally, Pyrex was made from borosilicate glass, known for its exceptional resistance to thermal shock. This made it suitable for both oven and stovetop use. However, in the latter half of the 20th century, Corning, the original manufacturer, switched to soda-lime glass for most Pyrex products sold in the US. Soda-lime glass is less expensive to produce, but also significantly more vulnerable to thermal shock, meaning rapid temperature changes can cause it to shatter.
Understanding Thermal Shock
Thermal shock occurs when different parts of a glass object experience drastically different temperatures simultaneously. This uneven heating creates stress within the glass, which can exceed its breaking point, leading to catastrophic failure. Borosilicate glass has a much lower coefficient of thermal expansion, meaning it expands and contracts less with temperature changes, making it more resistant to thermal shock. Soda-lime glass, with a higher coefficient of thermal expansion, is far more susceptible.
Identifying Stovetop-Safe Pyrex
Distinguishing between borosilicate and soda-lime Pyrex can be tricky. Older Pyrex, often stamped with the original Corning logo, is more likely to be borosilicate. Newer Pyrex sold in the US is almost always soda-lime. Always check the manufacturer’s instructions stamped on the bottom of the cookware or included with the packaging. If it doesn’t explicitly state it’s stovetop-safe, assume it’s not.
- Look for specific markings: Older Pyrex often has a “PYREX” marking in all capital letters and might mention “Made in USA by Corning.”
- Check the packaging: The packaging for new Pyrex will typically specify its intended use (oven-safe, microwave-safe, etc.).
- When in doubt, err on the side of caution: Avoid using any Pyrex on the stovetop unless you are absolutely certain it’s designed for that purpose.
Why the Risk? Safety First
Using standard soda-lime Pyrex on a stovetop poses a significant safety risk. The rapid and uneven heating from a stovetop burner can easily cause the glass to shatter explosively, sending hot shards of glass and food flying. This can result in serious cuts, burns, and other injuries. It’s simply not worth the risk to use Pyrex cookware on a stovetop unless it is explicitly designed and labeled for stovetop use.
Alternatives to Pyrex on the Stovetop
Fortunately, there are many safer and more suitable alternatives to Pyrex for stovetop cooking:
- Stainless Steel Cookware: Durable, versatile, and heats evenly.
- Cast Iron Cookware: Excellent heat retention and distribution, perfect for searing and frying.
- Enamel-Coated Cast Iron: Offers the benefits of cast iron with easy cleanup.
- Stovetop-Safe Glass Cookware: Some specialized glass cookware is designed for stovetop use; verify the manufacturer’s specifications before using.
Caring for Your Pyrex to Extend Its Life (Oven Use)
Even when used correctly in the oven, proper care can extend the life of your Pyrex cookware:
- Avoid extreme temperature changes: Let Pyrex cool gradually after removing it from the oven before washing.
- Don’t pour cold liquids into a hot Pyrex dish: This can cause thermal shock even in the oven.
- Use oven mitts or pot holders: Always protect your hands when handling hot Pyrex.
- Avoid scratching the glass: Use non-abrasive cleaners and avoid using metal utensils that can scratch the surface.
Frequently Asked Questions (FAQs)
Can I use Pyrex Vision on the stovetop?
Pyrex Vision (also sometimes referred to as Visions), a different product line than standard Pyrex, is made from Pyroceram, a glass-ceramic material specifically designed for stovetop use. However, it’s still crucial to check the manufacturer’s instructions, as older or damaged Visions cookware may be more susceptible to issues.
What happens if I accidentally put Pyrex on the stovetop?
If you accidentally place standard Pyrex on the stovetop, immediately turn off the heat. Let the Pyrex cool completely on the burner. Avoid moving it until it’s cool to the touch, as any sudden temperature change could cause it to shatter. Monitor the dish closely for signs of stress, such as cracks or cloudiness.
Is it safe to use Pyrex in the broiler?
Broiling can expose Pyrex to intense heat, potentially causing thermal shock. It is generally recommended to avoid using Pyrex under the broiler unless the manufacturer explicitly states it’s safe for that purpose. Check the markings on your specific Pyrex dish.
How can I tell if my Pyrex is borosilicate or soda-lime?
Unfortunately, there’s no foolproof method to definitively identify the glass type without specialized testing. Older Pyrex, especially those marked “Made in USA by Corning,” is more likely to be borosilicate. However, the safest approach is to assume that any Pyrex manufactured after the late 20th century is soda-lime and should not be used on the stovetop unless specifically labelled otherwise.
Does preheating the Pyrex in the oven make it safer for stovetop use?
No, preheating Pyrex does NOT make it safer for stovetop use. The rapid temperature changes and uneven heating from a stovetop burner are still the primary risk factors, regardless of the initial temperature of the Pyrex. Do not attempt this.
Can I use a heat diffuser to protect Pyrex on the stovetop?
While a heat diffuser might help distribute heat more evenly, it doesn’t eliminate the risk of thermal shock. Standard soda-lime Pyrex is still inherently vulnerable to temperature changes, and a diffuser is not a reliable safeguard.
What if my Pyrex dish has a small crack?
Never use a Pyrex dish that has a crack, chip, or other damage. These imperfections weaken the glass and make it much more susceptible to shattering, even in the oven. Dispose of damaged Pyrex safely to prevent potential injuries.
Is it okay to put a hot Pyrex dish on a cold countertop?
Placing a hot Pyrex dish directly on a cold countertop can cause thermal shock, even if it’s oven-safe. Always use a trivet or pot holder to protect the countertop and prevent the dish from shattering.
Can I use Pyrex to deep fry food on the stovetop?
Absolutely not. Deep frying involves extremely high temperatures and rapid temperature changes, making it extremely dangerous to use Pyrex (even if it’s Visions) on the stovetop for this purpose. The oil itself can also become a hazard if the Pyrex shatters.
What is the temperature limit for Pyrex in the oven?
While Pyrex is oven-safe up to 450°F (232°C), it’s important to avoid exposing it to sudden temperature changes. Gradual heating and cooling are crucial to prevent thermal shock. Always refer to the manufacturer’s instructions for specific temperature recommendations.
Can I use Pyrex on an induction stovetop?
Generally, no. Pyrex itself is not magnetic and therefore will not heat on an induction stovetop. While some induction cooktops might offer a “universal” setting, it’s still risky and not recommended to use Pyrex on them because of the rapid heat changes and uneven heating. Always refer to the manufacturer’s instructions for both the cookware and the stovetop.
Does the size or shape of the Pyrex dish affect its stovetop safety?
Yes, larger, thinner Pyrex dishes are generally more susceptible to thermal shock than smaller, thicker ones. The increased surface area and thinner glass make them more prone to uneven heating and subsequent shattering. However, regardless of the size or shape, standard Pyrex should not be used on the stovetop.