Is Corning Ware Microwave Safe? Ultimate Guide

Is Corning Ware Microwave Safe? Find out which Corning Ware® is safe for microwaving and which one to avoid. The French White and Gold products are microwave safe, while Centura is not. Discover the best microwave-safe cookware options from this American multinational technology company.

Are you wondering, “Is Corning Ware microwave safe?”

You’re not alone. Many home cooks and professional chefs alike have found themselves puzzled over this question, unsure of how to safely heat their favorite dishes.

The answer is yes, Corning Ware is indeed microwave-safe.

As a seasoned culinary expert with years of experience in kitchenware safety, I can assure you that this blog post will provide a comprehensive guide on how to use Corning Ware in the microwave safely. We’ll delve into the specifics of why Corning Ware is microwave safe, how to properly use it, and tips to prolong its lifespan. So, let’s put those worries to rest and get cooking!

Key Facts:

  • Corningware is microwave safe as long as it doesn’t have any metal parts attached. (Source: Team Research)
  • Corningware is made of Pyroceram, a material that can withstand extremely high temperatures without melting, burning, or sparking. (Source: Team Research)
  • Corningware is also free of harmful compounds that could leach into your food. (Source: Team Research)
  • Do not microwave Corningware with metal parts or finishes to avoid safety issues. (Source: Team Research)
  • Take care when microwaving convenience foods like popcorn in Corningware to prevent overheating. (Source: Team Research)

Is Corning Ware Microwave Safe?

Yes, Corning Ware is microwave safe. In fact, it is one of the most popular types of cookware for microwaving. Corning Ware is made of a type of ceramic called pyroceram, which is very durable and heat-resistant. This makes it safe to use in the microwave, oven, broiler, and even the dishwasher.

What is Corning Ware?

Corning Ware is a brand of glass-ceramic ovenware and tableware introduced in 1958. It is made of Pyroceram, a patented glass-ceramic material designed by Corning Inc. Pyroceram is known for its ability to withstand extreme temperatures and rapid temperature changes without breaking or cracking. It can go directly from the freezer to a hot oven or into the microwave without the risk of shattering. This makes it an incredibly versatile option for cookware.

Corning Ware’s unique properties come from its manufacturing process. The glassware is first formed and then undergoes controlled crystallization, which allows Pyroceram to expand and contract without weakening or fracturing. While Pyroceram contains some crystalline material, Corning Ware is about 75% amorphous, meaning it lacks a defined crystalline structure. This amorphous nature is key to its durability and heat resistance.

Over the decades, Corning has continued to innovate and create new varieties of iconic bakeware. However, all Corning Ware has Pyroceram as the core material which gives it the trusted heating performance.

Why is Corning Ware Microwave Safe?

Is Corning Ware Microwave Safe
Is Corning Ware Microwave Safe

Corning Ware is designed to be microwave safe when used properly, thanks largely to its Pyroceram composition. Here’s why Pyroceram allows Corning Ware to withstand microwave cooking:

  • Extreme temperature resistance – Pyroceram expands slightly when heated but will not melt or combust even at temperatures exceeding 1600°F. This makes it suitable for the intense heat generated inside a microwave.
  • Does not arc or spark – Metals are unsafe in the microwave because they reflect radiation, potentially causing electrical arcing. Pyroceram is non-metallic so it absorbs microwaves evenly and heats without issue.
  • Inert materialPyroceram is chemically non-reactive. It does not contain compounds like lead or cadmium that could leach into foods during microwave heating.
  • Withstands thermal shock – Pyroceram resists fracture from sudden temperature changes. You can microwave Corning Ware from frozen without worrying about cracking.
  • Durable construction – Corning Ware maintains its integrity over time. The special crystallization of Pyroceram prevents weakening stresses after repeated microwave uses.

With proper use, you can feel confident that Corning Ware is a safe and reliable material for microwave cooking. It’s been trusted for over 60 years for good reason!

Types of Corning Ware

While most Corning Ware products are microwave-safe using the guidelines provided, there are some variations to be aware of:

  • Corning Ware French White – The original white Corning Ware made of Pyroceram is microwave safe. This includes various French White baking dishes, pie plates, and teaware.
  • Corning Ware Cornflower Blue – Introduced in the 1960s, the blue floral pattern is as microwave-safe as the original white.
  • Corning Ware Centura – Centura has a metal base making it unsafe for microwave use. The material is still Pyroceram but requires oven heating.
  • Corelle Livingware – Produced after 1998 and made of Vitrelle glass, Corelle Livingware can be microwaved without issue.
  • Visions, Alegria, Chef’s Classic – Other more recent lines of Corning Ware incorporate Pyroceram and are microwave-safe.

Always check your Corning Ware item carefully for any metal components. Also verify if the dish is classified as oven-safe, as some mugs and teaware may only be meant for stovetop heating. When in doubt, consult the manufacturer guidelines for your specific Corning Ware model.

Precautions for Using Corning Ware in the Microwave

While Corning Ware is generally microwave-safe, follow these precautions every time you use it in the microwave:

  • Avoid any metal parts or finishes – Metallic paints, gold rims, handles, or bases can cause arcing and make Corning Ware unsafe for microwave use. Never microwave Corning Ware with metal components.
  • No prepackaged convenience foods – The high fat or sugar content in microwave popcorn, frozen meals, bacon, buttery sauces etc. can lead to overheating in a Pyroceram dish. Heat these items in microwave-safe plastics instead.
  • Low power for long cook times – Start at 50% power and incrementally increase to avoid boiling over or uneven cooking of dense foods. Remove immediately if seeing smoking or bubbles.
  • No rapid temperature changes – Do not put extremely hot Corning Ware straight into the fridge. Allow dishes to cool gradually to prevent cracking from thermal shock.
  • Proper handling – Always use oven mitts and handle with care when removing hot Corning Ware from the microwave, it retains heat very well. Avoid dropping or Top handle with care.

Testing Corning Ware for Microwave Safety

Not sure if your Corning Ware dish can go in the microwave? Here are some simple ways to test it at home:

  • Check markings – Look for any microwave-safe logos or verbiage indicating oven-to-table usability. Avoid dishes marked oven-use only.
  • Magnet test – Use a refrigerator magnet to detect metal along the rim, base, or other hidden parts. Magnetic pull indicates metal.
  • Water test – Place 1 cup of water in the empty dish and microwave for 1 minute at full power. If the water heats normally without arcing, sparking, or bubbling, the dish is likely microwave-safe.
  • Verify material – Check that the dish is fully made of glass, ceramic, and Pyroceram. Avoid any plastic/melamine dishes marketed under the brand.
  • Consult manufacturer – If still uncertain, contact Corning Ware directly with your model name/number to verify microwave suitability.

Remember, when in doubt, do not microwave it! Use these simple tests to make sure your Corning Ware is 100% safe for microwave use.

Proper Care and Maintenance of Corning Ware

To help your Corning Ware last for years, adhere to the following care and cleaning guidelines:

  • Allow to cool before cleaning – Wait until Corning Ware is completely cool before cleaning to prevent thermal shock. Avoid drastic temperature changes.
  • Handwash only – Do not clean Corning Ware in the dishwasher, as harsh detergents can damage its surfaces over time. Always handwash with mild soap and water.
  • No harsh scouring – Scraping or scrubbing can mar the Corning Ware surface. For stuck-on residue, fill with warm water and let soak before handwashing.
  • Towel dry and air dry thoroughly – Rubber dish mats can trap moisture and lead to mineral deposits over time. Fully air dry pieces after hand washing.
  • Proper storage – To prevent scratching, carefully nest Corning Ware pieces of similar sizes when stacking together. Never stack on top of other dish types.

Follow these care instructions and your Corning Ware can safely withstand thousands of uses in the microwave, oven, and stovetop for many years to come!

FAQs About “Is Corning Ware Microwave Safe?”

Can I use Corning Ware in the microwave?

Yes, most Corning Ware is microwave-safe. As long as your dish does not contain any metal components and is not specified as “oven-use only”, Corning Ware can be used in the microwave. However, take care not to microwave greasy or sugary convenience foods in Corning Ware as this causes overheating.

Is Corning Ware safe for microwaving?

Corning Ware is designed to be safe for microwaving thanks to its durable Pyroceram glass-ceramic material. Pyroceram can withstand extreme heat and rapid temperature changes without cracking, burning, or leaching chemicals. As long as you avoid metallic accents and handle hot dishes carefully, Corning Ware is a microwave-safe choice.

Can Corning Ware dishes be used in the microwave?

Most genuine Corning Ware ovenware made of Pyroceram can absolutely be used in the microwave safely and effectively for cooking foods, reheating leftovers, melting butter, and more. The exceptions are any dishes with metal parts like Centura. Always check your specific Corning Ware item for microwave safety before using it.


In conclusion, Corning Ware is indeed microwave safe, making it a convenient and versatile option for your kitchen needs. With its exceptional heat resistance and safety features, you can confidently use Corning Ware for microwave cooking as long as you follow a few common-sense precautions. Avoid metal, limit greasy foods, handle with care, and microwave at conservative power levels. Follow proper cleaning and storage methods to keep your Corning Ware performing safely for years of cooking and reheating!

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Jennifer Smith
Jennifer Smith

Jennifer Smith is a respected kitchenware expert with over 10 years of experience in product development, sourcing, and quality control. She creates innovative and practical products for leading brands and retailers, helping people cook with ease. Jennifer's passion for cooking and helping others has made her an influential figure in the kitchenware industry.