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A low U-value maintains inside glass temperatures at a more uniform level throughout the year. During the winter, downwards convection currents (downdrafts) are very small, thereby enabling people seated near such a multipane window to feel as comfortable adjacent to the window as they would feel if they were seated adjacent to a solid wall. [1]
[68] [76] Soda–lime–silicate glass is transparent, easily formed, and most suitable for window glass and tableware. [77] However, it has a high thermal expansion and poor resistance to heat. [77] Soda–lime glass is typically used for windows, bottles, light bulbs, and jars. [75]
The glass floats on the tin, and levels out as it spreads along the bath, giving a smooth face to both sides. The glass cools and slowly solidifies as it travels over the molten tin and leaves the tin bath in a continuous ribbon. The glass is then annealed by cooling in an oven called a lehr. The finished product has near-perfect parallel surfaces.
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. ...
A typical installation of insulated glass windows with uPVC frames. Possibly the earliest use of double glazing was in Siberia, where it was observed by Henry Seebohm in 1877 as an established necessity in the Yeniseysk area where the bitterly cold winter temperatures regularly fall below -50 °C, indicating how the concept may have started: [2]
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