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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 B 2 O 3 content for borosilicate glass is typically 12–13% and the SiO 2 content over 80%. High chemical durability and low thermal expansion (3.3 × 10 −6 K −1) – the lowest of all commercial glasses for large-scale technical applications – make this a versatile glass material. High-grade borosilicate flat glasses are used in a ...
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