Why Isn't Pyrex Safe Anymore?

    Pyrex glass, as a borosilicate glass, still has the characteristics of low expansion coefficient, high heat resistance and chemical stability. However, it is not as safe as high borosilicate glass. The main focus is on the following aspects:
    1. Material changes
After 1998, some Pyrex brand kitchenware changed from borosilicate glass to prestressed soda-lime glass to improve mechanical strength. Although soda-lime glass has improved impact resistance, its heat resistance is lower than that of borosilicate glass, and it may be more likely to break when the temperature changes greatly.
    2. Production process
If the temperature is not well controlled during the glass molding process, the glass quality will be affected due to the failure of the expansion coefficient, resulting in different degrees of breakage and even causing injuries to users.
    3. Improper use and maintenance
Even high-quality Pyrex glass products may break if they are used improperly, such as sudden exposure to extreme temperatures. In addition, over time, glass products may develop tiny cracks or damage, which may expand under certain conditions and cause breakage.
    In general, the basic properties of Pyrex glass as a material have not changed, but changes in the material of the product line and adjustments in the production process, as well as improper use and maintenance, may cause some consumers to have doubts about the safety of Pyrex glass products. Consumers are advised to follow the manufacturer's guidance when purchasing and using Pyrex glass products to ensure safe use.