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uncountable
A kind of heat-resistant borosilicate glass, made by mixing a high concentration of boron oxides into the molten glass to reduce its thermal expansion coefficient. quotations examples
This steel tube slips into the pyrex glass focus tube, which is jacketed by a vacuum
1993, George Samuel Schuyler with Robert A. Hill and R. Kent Rasmussen, Black Empire, page 53
There is half of a yesteryear's tin of baked beans in a pyrex bowl
2007, Jane Gardam, The Queen of the Tambourine
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.
2010, Ross Macdonald, The Ferguson Affair
(by extension) Any borosilicate glass examples
(by extension) Any glass capable of withstanding high temperatures, such as tempered glass suitable for cooking examples