Borosilicate glass is made by melting sand with boron trioxide to limit the material’s ability to expand when exposed to heat. This makes it the ideal material for making glass cookware, containers, and even scientific tools. You’ve likely used it before without even realizing it. In this overview, we’ll explain everything you need to know about borosilicate glass. Get ready to learn how it’s made, what sets it apart from standard glass, where you’ve likely seen it before, and how safe it is for your family and friends.