Rarely used. Original owner. I have 2 of these.
Oven Safe. This item can withstand high heat applications and is safe for oven use in food service.
Arcopal opal is strengthened by a specific heat treatment known as tempering, making it up to three times more shock-resistant than other materials. Arcopal opal withstands sudden variations of 135°C: it is safe to transfer products directly from the refrigerator to the microwave oven.