You may have heard that uppercase PYREX and lowercase pyrex labels on cookware indicate what materials the items are ... While you can't tell a piece's precise glass composition by label alone, ...

The secret to the original PYREX’s heat resilience is its borosilicate composition, a glass made of silica and boron trioxide. Glass expands when it’s hot and contracts while cooling.

I’ve used Pyrex’s glass liquid measuring cup set for years. It’s non-toxic, dishwasher-safe, and available at Amazon for less than $9 apiece.

The Pyrex glass measuring cup is a staple in my kitchen, as it is for so many cooks. Beyond that, I use Pyrex casserole dishes, loaf pans, and pie pans often.

For Amanda Homrighausen, the best part of collecting antique Pyrex cookware is the hunt. When the 41-year-old enters thrift stores looking for glassware made by the century-old brand, she says her ...