In my search, I learned the product had been made during different eras, by 2 different manufacturers, and from 2 different types of glass. The many postings of random explosions prompted me to e-mail the current manufacturer regarding its safety. It took about a week because my contact person went to great lengths to get accurate information and the result was a resounding yes with no mention of safeguards in regards to heat temperature, open flame, extreme temperature change etc.

I proceded to purchase 3 pieces of cookware from eBay and used two of them last Saturday for the first time. After 10 minutes on med heat on top of my gas range, the pot containing green beans and a small amount of water exploded. Fortunately no person was near and no injuries occurred.