Why would a glass pan explode?

As a materials science and kitchen safety expert, I have extensive knowledge in the properties of various materials, including glass, and how they behave under different conditions. Glass, particularly when used in cookware, can be a delicate balance of utility and fragility. Let's delve into the reasons why a glass pan might explode.

Thermal Shock
The primary reason a glass pan can explode is due to a phenomenon known as thermal shock. This occurs when the glass is subjected to a sudden and extreme change in temperature. For instance, placing a hot pan on a cool surface, such as a cold countertop or a wet dish rack, can cause a rapid temperature change at the point of contact. The rapid cooling of the glass can lead to internal stress, which, if severe enough, can result in the glass shattering.

Uneven Heating
Another factor that can lead to the explosion of a glass pan is uneven heating. When a pan is heated on a stove, the heat distribution might not be uniform, especially if the heat source is not properly aligned with the pan's base. This can cause some areas of the pan to become hotter than others, leading to differential thermal expansion. If the temperature difference is significant, the glass can crack or even explode.

Quality of Glass
The quality of the glass used in the pan plays a crucial role in its resistance to thermal stress. Not all glass is created equal; some types are more resistant to thermal shock than others. For example, borosilicate glass, which is often used in high-quality cookware, has a higher resistance to thermal shock compared to regular soda-lime glass. However, even borosilicate glass can experience thermal breakage if exposed to sudden or uneven temperature changes, as mentioned by the company.

Design and Construction
The design and construction of the glass pan can also influence its stability. A well-designed pan will have features that help distribute heat evenly and reduce the risk of thermal shock. For example, some pans have a reinforced rim or a thicker base to provide additional strength and durability.

Use and Care
Proper use and care of the glass pan are essential to prevent explosions. Avoid subjecting the pan to extreme temperature changes, such as moving it directly from a hot stove to a cold sink. Also, ensure that the pan is heated evenly, and do not expose it to direct flame or high heat without adequate liquid to prevent rapid temperature increases.

Manufacturing Defects
Finally, manufacturing defects can also lead to the explosion of a glass pan. Imperfections in the glass, such as bubbles, cracks, or uneven thickness, can act as stress points that weaken the structure and make it more susceptible to breaking.

In conclusion, the explosion of a glass pan is typically a result of thermal shock, uneven heating, the quality of the glass, the design and construction of the pan, proper use and care, and potential manufacturing defects. Understanding these factors can help in the prevention of such incidents and ensure the safe use of glass cookware.

Putting a hot pan on a cool surface, or roasting at high heat without enough liquid may cause problems. According to the company, --All glass, even borosilicate, can experience thermal breakage if exposed to sudden or uneven temperature changes.--Dec 26, 2012