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These Internet rumors are false and have been refuted by "myth-busting" websites such as Snopes.com and STATS.org

World Kitchen did not change the product composition for Pyrex glass bakeware. Pyrex glass bakeware has been made – first by Corning Incorporated and now by World Kitchen – using the same soda lime composition and heat-strengthening process for more than 60 years. Corning Incorporated began making Pyrex glass bakeware from borosilicate glass in 1915 and in the 1940s began making Pyrex glass bakeware from soda lime.

Today, World Kitchen uses the same soda lime plant in Charleroi, Pennsylvania, to make Pyrex glass bakeware that Corning Incorporated used and has not changed the manufacturing process or soda lime composition.

While both soda lime and borosilicate are appropriate compositions for glass bakeware, heat strengthened soda lime is more resistant to impact breakage – the far more likely cause of consumer injury.  According to the Consumer Product Safety Commission’s National Electronic Injury Surveillance System data, consumers are far more likely to be injured by dropping glass bakeware than from breakage caused by sudden or uneven temperature changes.

Additionally, Pyrex glass bakeware is heat strengthened to increase its resistance to breakage caused by impact or sudden, uneven temperature changes. We also employ stringent manufacturing standards and rigorous testing to ensure Pyrex glassware quality.

The safety of consumers is always our highest priority and we are committed to minimizing breakage of any kind. As part of our ongoing quality assurance procedures, we continually review and enhance our Safety and Usage instructions which are provided with all Pyrex glass bakeware.

Keep in mind, all glass, whether soda lime or borosilicate, can experience thermal breakage if exposed to sudden or uneven temperature changes. You can avoid the most common causes of thermal breakage by following four simple rules:

We have also launched a national consumer education campaign with Sandra Lee to increase awareness of these four simple rules for cooking with care when using glass bakeware. Click here for more information.

Before using Pyrex glass bakeware, please read and follow our Safety & Usage Instructions.

If you have any questions or concerns about Pyrex glass bakeware, please contact our Customer Care Center by calling 1-800-999-3436.

Is Pyrex safe?

Pyrex glass bakeware is, and has always been, durable, reliable and safe. The number of consumers who have reported that their Pyrex glassware broke unexpectedly is extremely small compared to the billions of pieces of Pyrex glassware safely and reliably used in American kitchens for generations. The safety of consumers is our highest priority and we are committed to minimizing breakage of any kind. As part of our ongoing quality assurance procedures, we continually review and enhance our Safety and Usage instructions, which are provided with all Pyrex glass bakeware.

Can Pyrex bakeware break unexpectedly?

All glass, even borosilicate, can experience thermal breakage if exposed to sudden or uneven temperature changes. You can avoid the most common causes of thermal breakage by following four simple rules:

• Always place hot glass bakeware on a dry, cloth potholder or towel.
  • Never place hot glass bakeware on top of the stove, on a metal trivet, on a damp towel, directly on a counter or in a sink.
• Never put glass bakeware directly on a burner or under a broiler.
• Always allow the oven to fully preheat before placing glass bakeware in the oven.
• Always cover the bottom of the dish with liquid before cooking meat or vegetables.

Have a lot of consumers experienced unexpected breakage?

The number of consumers who have reported that their Pyrex glassware broke unexpectedly is extremely small compared to the billions of pieces of Pyrex glassware safely and reliably used in American kitchens for generations. The safety of consumers is our highest priority and we are committed to minimizing breakage of any kind. As part of our ongoing quality assurance procedures, we continually review and enhance our Safety and Usage instructions which are provided with all Pyrex glass bakeware.

Did World Kitchen change the way Pyrex is made?

World Kitchen did not change the product composition of Pyrex glass bakeware. For more than 60 years, Pyrex glass bakeware has been made – first by Corning Incorporated and now by World Kitchen – using the same soda lime composition and heat-strengthening process at the same soda lime plant in Charleroi, Pennsylvania. Corning Incorporated began making Pyrex glass bakeware from borosilicate glass in 1915 and in the 1940s began making Pyrex glass bakeware from soda lime.

Is Borosilicate glass safer or better than soda lime glass?

• Always place hot glass bakeware on a dry, cloth potholder or towel.
  • Never place hot glass bakeware on top of the stove, on a metal trivet, on a damp towel, directly on a counter or in a sink.
• Never put glass bakeware directly on a burner or under a broiler.
• Always allow the oven to fully preheat before placing glass bakeware in the oven.
• Always cover the bottom of the dish with liquid before cooking meat or vegetables.

Did World Kitchen move production to China when it purchased the Pyrex consumer bakeware business?

No. These internet rumors are false and have been refuted by "myth-busting" web sites such as Snopes.com and STATS.org. World Kitchen has always manufactured Pyrex glass bakeware in the U.S. In fact, the Pyrex glass bakeware sold in North America has been made in the United States since 1915. World Kitchen, which purchased the Pyrex consumer products business from Corning Incorporated in 1998, is a U.S. company based in Rosemont, Illinois. Pyrex packaging proudly displays the American flag and the "made in the USA" label.