Definition of "borosilicate" []

• A salt that is derived from both boric acid and silicic acid and occurs naturally in dumortierite. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Immobilize waste in an insoluble matrix such as borosilicate glass or synthetic rock (fuel pellets are already in the form of a very stable ceramic: UO2);"
• "Those are great glasses, borosilicate which is the same kind of glass as Pyrex lab glass which means it's stronger and can handle high heat and temperature shocks without cracking."
• "As it is made from borosilicate glass you can pour hot water directly into it, however at no time should it be allowed to stand directly on a heat source."