Why did Pyrex stop using borosilicate?

Transition from Borosilicate to Soda-Lime Glass in Pyrex Cookware

Pyrex, a brand name for glass cookware, has undergone a significant material change in its manufacturing process. Initially, Pyrex was made from borosilicate glass, known for its exceptional resistance to thermal shock. However, the brand shifted towards using soda-lime glass in the United States. This transition has sparked discussions among consumers and experts alike regarding the reasons behind the change and its implications.

Reasons for the Transition from Borosilicate to Soda-Lime Glass

• Cost-Effectiveness: Soda-lime glass is less expensive to produce than borosilicate glass. The lower production costs of soda-lime glass made it a financially viable option for mass production.
• Impact Resistance: Soda-lime glass offers greater resistance to mechanical breakage compared to borosilicate glass. This characteristic makes it more suitable for everyday kitchen use where drops and knocks are common.
• Manufacturing Considerations: The transition also aligns with manufacturing efficiencies. Soda-lime glass can be produced at a larger scale and with less energy consumption compared to borosilicate glass, making it a more sustainable option for large-scale production.

Implications of the Material Change

The switch to soda-lime glass has raised concerns regarding the thermal shock resistance of Pyrex cookware. While borosilicate glass can withstand sudden temperature changes more effectively, soda-lime glass is more prone to breaking under such conditions. Consumers are advised to avoid exposing Pyrex soda-lime glassware to extreme temperature changes.

In conclusion, the decision by Pyrex to transition from borosilicate to soda-lime glass was driven by cost, durability, and manufacturing efficiencies. While this change has led to concerns about thermal shock resistance, it has also made Pyrex products more resistant to mechanical breakage, potentially increasing their longevity in everyday use. Consumers should be mindful of the care instructions to maximize the lifespan of their Pyrex glassware.