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A PYREX measuring cup manufactured c. 1980, featuring graduations in both U.S. and metric units. Pyrex (trademarked as PYREX and pyrex) is a brand introduced by Corning Inc. in 1915, initially for a line of clear, low-thermal-expansion borosilicate glass used for laboratory glassware and kitchenware.
Borosilicate glass is a type of glass with silica and boron trioxide as the main glass-forming constituents. Borosilicate glasses are known for having very low coefficients of thermal expansion (≈3 × 10 −6 K −1 at 20 °C), making them more resistant to thermal shock than any other common glass.
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]).
Soda–lime glass (for containers) [2] Borosilicate (low expansion, similar to Pyrex, Duran) Glass wool (for thermal insulation) Special optical glass (similar to Lead crystal) Fused silica Germania glass Germanium selenide glass Chemical composition, wt% 74 SiO 2, 13 Na 2 O, 10.5 CaO, 1.3 Al 2 O 3, 0.3 K 2 O, 0.2 SO 3, 0.2 MgO, 0.01 TiO 2, 0. ...
In 1983, it was introduced in the US and became the number one selling cookware set for a number of years. Visions is made of a transparent version of Pyroceram glass-ceramic, occasionally referred to as Calexium. However, its lids have typically been made out of Pyrex (both Borosilicate and Soda-lime glass) in the US and Asia. Originally ...
In 1966 Pyrex 7740 had a composition of about 80.6% SiO 2, 13% B 2 O 3, 4.3% Na 2 O and 2.1% Al 2 O 3. [75] Similar glasses have a coefficient of linear expansion of about 3 parts per million per Kelvin at 20°Celsius. [78] Density [Pyrex 774] ≈ 2.210 g ⋅ cm −3 at 32 °F.