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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.
During the pandemic when hobby baking soared, the company could not keep up with demand for its measuring cups on Amazon, so it shifted product manufacturing to China from March 2021 to May 2022.
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A Pyrex borosilicate glass measuring cup Borosilicate glasses (e.g. Pyrex , Duran ) typically contain 5–13% boron trioxide (B 2 O 3 ). [ 75 ] Borosilicate glasses have fairly low coefficients of thermal expansion (7740 Pyrex CTE is 3.25 × 10 −6 /°C [ 78 ] as compared to about 9 × 10 −6 /°C for a typical soda–lime glass [ 79 ] ).
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A decorated, transparent plastic feeding bottle with blue cap and silicone teat, anti-leakage plate and screw mounting from 2007 . A baby bottle, nursing bottle, or feeding bottle is a bottle with a teat (also called a nipple in the US) attached to it, which creates the ability to drink via suckling.
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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