To determine if an old Pyrex dish is safe to use in the microwave and/or oven, you can follow these steps:
Check for labeling: Look for any markings or labels on the dish itself. Pyrex dishes that are safe for microwave and oven use typically have specific symbols or labels indicating their compatibility with these appliances. Look for labels such as "Microwave Safe," "Oven Safe," or symbols like waves (indicating microwave use) and oven icons.
Examine the condition: Inspect the dish for any signs of damage, such as cracks, chips, or scratches. These imperfections can weaken the dish and make it unsafe for use, especially in high-heat environments like ovens. If you notice any damage, it's best to avoid using the dish.
Consider the age: If you have an older Pyrex dish, it's worth noting that there have been changes in Pyrex manufacturing over the years. Older Pyrex dishes, particularly those made before the 1990s, were made of borosilicate glass, which had a higher resistance to thermal shock. Newer Pyrex dishes are typically made of soda-lime glass, which may not have the same level of thermal resistance. If you have an older Pyrex dish, exercise extra caution and avoid subjecting it to extreme temperature changes.
Research the model: If you're unsure about the specific model or vintage of your Pyrex dish, you can try researching online or contacting the manufacturer directly. They may have information about the dish's compatibility with microwave and oven use.
If you have any doubts about the safety of an old Pyrex dish, it's best to err on the side of caution and refrain from using it in the microwave or oven. It's always important to prioritize safety when using glassware in high-temperature applications.