Pyrex

This steel tube slips into the pyrex glass focus tube, which is jacketed by a vacuum

There is half of a yesteryear's tin of baked beans in a pyrex bowl

I tiptoed into the kitchen, turned on the fluorescent light over the stove, and peered into the oven. It was still warm, though the gas had been turned off. My dinner was there, in a pyrex dish with a cover.