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Older clear-glass Pyrex manufactured by Corning, Arc International's Pyrex products, and Pyrex laboratory glassware are made of borosilicate glass. According to the National Institute of Standards and Technology , borosilicate Pyrex is composed of (as percentage of weight): 4.0% boron , 54.0% oxygen , 2.8% sodium , 1.1% aluminum , 37.7% silicon ...
The lids of CorningWare are typically made of Pyrex. Though some early lids were made of Pyroceram, most subsequent covers have been made of borosilicate or tempered soda-lime glass. Unlike the cookware, these lids have a lower tolerance for thermal shock and cannot be used under direct heat.
250ml DURAN® laboratory bottle. DURAN is a brand name for the internationally defined borosilicate glass 3.3 (DIN ISO 3585) produced by the German company DURAN Group GmbH since 2005 under license from the Schott AG, which was the first to develop it, and which sold it from 1893 until the equity carve-out of the DURAN Group in 2005.
Perfect for Valentine’s Day, this colorful Pyrex pattern is among the rarest in the world. Released for a limited time in 1959, the bowl is considered a collector’s dream.
A dark glass bottle with ground glass plug. Reagent bottles, also known as media bottles or graduated bottles, are containers made of glass, plastic, borosilicate or related substances, and topped by special caps or stoppers. They are intended to contain chemicals in liquid or powder form for laboratories and stored in cabinets or on shelves ...
The softening point (temperature at which viscosity is approximately 10 7.6 poise) of type 7740 Pyrex is 820 °C (1,510 °F). [8] Borosilicate glass is less dense (about 2.23 g/cm 3) than typical soda–lime glass due to the low atomic mass of boron. Its mean specific heat capacity at constant pressure (20–100 °C) is 0.83 J/(g⋅K), roughly ...
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Different types of glass have different composition, but they are all glass. If you argue that boron makes glass "impure", then quartz glass (containing SiO2 only) is the only "pure" glass and practically all glasses found, including lime-soda glass, which is what practically all glass items are made of, are impure.
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