Bakeware Facts

WARNING: Always check the bottom of glassware to ensure it is microwave and oven safe.
What Anchor Hocking Products are considered bakeware?

• Baking Dishes
• Casserole Dishes with Glass Covers
• Handled Measuring Cups (1 cup, 2 cup, 4 cup)
• Batter Bowls
• Mixing Bowls (1 qt., 1.5 qt., 2.5 qt., 3.5 qt., and 4 qt.)
• Custard Cups
• Food Storage
*Always use dry oven mitts or potholders when removing glass from the oven or microwave.


Anchor Hocking bakeware is safe. Anchor Hocking is proud that its products have been a safe and reliable part of American kitchens for generations. Anchor Hocking has never had any of its products recalled by the Consumer Product Safety Commission (CPSC). Specifically, Anchor Hocking’s tempered soda-lime-silicate glass bakeware has been in the marketplace for over 40 years with an excellent safety and customer satisfaction record.

Moreover, even with the obvious and known limitation that glass can break, the number of injuries associated with the use of glass bakeware is remarkably small. The National Electronic Injury Surveillance Survey (NEISS), which is used by product safety experts to assess the risk of consumer products, shows that there are minimal claims of injuries resulting from glass bakeware unexpectedly breaking or shattering. Without doubt, Anchor Hocking’s glass bakeware is an extraordinarily safe product when used in accordance with safety and usage instructions.


Anchor Hocking’s glass bakeware is manufactured in full compliance with the applicable industry standard set forth in Chapter 24 of The Cookware & Bakeware Alliance Engineering Standards for Cookware and Bakeware.


Today, all U.S. manufactured glass bakeware, regardless of manufacturer, is made from tempered soda-lime-silicate glass. Tempered or heat-strengthened bakeware is designed to strengthen the glass to be more durable and stronger than other glass products. A similar, although not identical tempering process is used for other glass products where safety is also important, such as automobile windows, sliding glass doors, and shower doors. As a result of this tempering process, when Anchor Hocking tempered bakeware breaks, similar to other tempered safety glass products, it breaks into a number of pieces, most relatively small (some may be larger). Unlike non-tempered glass products, these pieces generally lack sharp edges when it does break, resulting in a lower likelihood of severe cuts from the broken glass. Bakeware failure releases a level of energy that causes a loud sound that consumers have described as a “bang” or “explosion” resulting in the smaller shards to be released outward. This method of failure is by design and is in fact a safety feature rather than evidence of a defect.

The tempering process is essential in making Anchor Hocking glass as strong and safe as possible. Damage to the glass can occur from improperly scouring with abrasives, use of sharp utensils, impact with other hard objects, and severe temperature changes. Mechanical breakage caused by an impact is the most frequent cause of failure. Accordingly, the soda-lime-silicate glass is stronger than other glass against impacts such as being hit against something or being dropped. Likewise, having the bakeware break in a safer manner by breaking into pieces generally lacking sharp edges and shards is a priority. Finally, Anchor Hocking’s bakeware is as strong as other types of glass bakeware against stresses such as temperature changes. Tempering or heat strengthening soda-lime-silicate glass achieves all these goals better than other glass processes.

ANCHOR HOCKING’S TEMPERED Soda-Lime-Silicate BaKEWARE Is Safer Than Borosilicate

Anchor Hocking has been manufacturing tempered soda-lime-silicate bakeware for nearly 40 years. Prior to that time, most glass bakeware was annealed borosilicate.
Tempered soda-lime-silicate is stronger and more durable, breaks into relatively small pieces (some may be larger) generally lacking sharp edges and shards when it does break. Anchor Hocking’s thermally-strengthened soda-lime-silicate glass bakeware is fully suitable and safe for oven use. It is thermally treated or tempered to more than double the mechanical strength of annealed borosilicate. Anchor Hocking’s tempered soda-lime-silicate has equal to or greater thermal shock resistance than annealed borosilicate glass bakeware. Tempered soda-lime-silicate has resulted in significantly fewer failures and, most importantly, fewer severe injuries than annealed borosilicate over decades of use. Indeed, reports of glass bakeware breakage filed with the CPSC markedly declined after the change from borosilicate glass to tempered soda-lime-silicate glass.

Annealed borosilicate is substantially weaker against mechanical breakage caused by dropping, striking against hard objects, and use of sharp utensils. Further, when borosilicate glass breaks, it breaks into larger, heavier pieces of very sharp glass creating a significant risk of severe cuts, punctures, etc. Significantly, Anchor Hocking experienced a greater than 90% reduction in its replacement rate due to breakage during the first 10 years of tempered soda-lime-silicate production.

Another potential failure mode of glass bakeware is thermal shock which results from a significant and sudden temperature change. Consistent scientific testing for decades has established that tempered soda-lime-silicate bakeware is at least equal to or better than annealed borosilicate products in thermal shock resistance. In fact, when the decision was made to change from borosilicate to tempered soda-lime-silicate, over 40 years ago, Anchor Hocking’s testing demonstrated a 40% improvement in thermal shock resistance for its tempered soda-lime-silicate glass.

Manufacturers of glass bakeware, including Anchor Hocking, have studied and evaluated the safety of glass bakeware while considering the rigors of cooking. Mechanical breakage (i.e., dropping or impact with other hard objects) is the most frequent failure mode and can result in the most severe types of injuries. Accordingly, making the bakeware stronger and more durable against mechanical breakage is a priority. Further, having the bakeware break in a safer manner by breaking into relatively small pieces (some may be larger) generally lacking sharp edges and shards is a priority. Tempered soda-lime-silicate glass best achieves both of these goals.

What would cause my Anchor Hocking bakeware to break?

Glass bakeware is not without limitations. While it is a healthier alternative to metal bakeware because no hazardous materials leach into your food and cooks often prefer it because it helps retain moisture and bakes more evenly; like all glass, it can break. Anchor Hocking bakeware is safe when its care and use instructions are followed. Regardless of the safety measures taken by Anchor Hocking to strengthen and ensure the quality of its products, misuse can lead to failure of the bakeware.
It has been Anchor Hocking’s experience that the vast majority of failures are due to mishandling or improper care of the product. It is important to note that the misuse often happens over time and the actual failure may occur at a later date. A few examples (but not an exhaustive list) of this type of mishandling are:

• Scouring or improperly cleaning the bakeware.
• Causing severe thermal shock by adding liquid to a hot dish, placing a hot dish into the dishwater,  or placing a hot dish directly on a countertop rather than using pot holders, pad or trivet.
• Using chipped, cracked, or noticeably scratched bakeware products.
• Hard hits or impacts occurring during usage, washing, or storing.
• Cooking at a higher temperature than 425°F.
• Using on a stove top, broiler or toaster oven.
• Placing bakeware on a recently used or still warm stovetop burner.

Properly caring for and using your Anchor Hocking bakeware is a critical step in maintaining its integrity and safety. Anchor Hocking’s bakeware must be properly cared for and used according to instructions for it to perform as expected.


Glass is 100% recyclable and Anchor Hocking has always take great efforts to maximize the environmental benefits of its products.


Our Consumer Relations Department is available to help resolve any consumer questions or concerns. To contact our team, please click HERE.

In addition, if you have a broken Anchor Hocking product, please be sure to keep all pieces of the product. Anchor Hocking welcomes the opportunity to examine the product to determine the cause of any product failure. Photos will not allow us to determine the cause of any product failure.

Contact us at or call 1-800-562-7511 ext 2478

For additional product information and frequently asked questions, please click HERE.

Sign up to join our newsletter