The piece does say this: "In 1942, the Museum of Modern Art praised the functionality of Pyrex designs by featuring several products in its exhibition “Useful Objects in Wartime under $10.” Around the same time, the company was developing a line of tough white dishes for military mess halls made from tempered soda-lime instead of borosilicate, making them less heat-resistant but also less likely to shatter when dropped. After World War II, this military glassware evolved into the brand’s popular Opalware line of kitchenware."