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2. Glazing (window) - Wikipedia

   en.wikipedia.org/wiki/Glazing_(window)

   The ideal gap size varies by location, but on average it ranges from 15-18 mm thick, giving a final assembly size of 23-26 mm assuming a typical glazing thickness of 4 mm. [9] A double-paned window with air in the gap has an R-value of 2.1, which is much better than the 0.9 that a single pane of glass yields. A triple-paned window, which is not ...

3. Insulated glazing - Wikipedia

   en.wikipedia.org/wiki/Insulated_glazing

   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]

4. Optical flat - Wikipedia

   en.wikipedia.org/wiki/Optical_flat

   At 2 inches (5.1 cm) in diameter and 0.5 inches (13 mm) thick, both surfaces are flat to within 1/10 of the wavelength of the light (58.9 nm), as indicated by the perfectly straight fringes. An optical flat is an optical -grade piece of glass lapped and polished to be extremely flat on one or both sides, usually within a few tens of nanometres ...

5. Float glass - Wikipedia

   en.wikipedia.org/wiki/Float_glass

   Most window glass in the early 19th century was made using the cylinder method. The 'cylinders' were 6 to 8 feet (180 to 240 cm) long and 10 to 14 inches (25 to 36 cm) in diameter, limiting the width that panes of glass could be cut, and resulting in windows divided by transoms into rectangular panels.

6. Beveled glass - Wikipedia

   en.wikipedia.org/wiki/Beveled_glass

   Beveled glass has also been used with clear and colored textured glass to create designs. Textured glass is typically 1 ⁄ 8 inch (3 mm) thick and has a distinct visible texture. Beveled glass is typical made from 1 ⁄ 4 inch (6 mm) float plate glass but thicknesses up to 1 ⁄ 2 inch (10 mm) have been used for larger windows. The width of ...

7. Glass brick - Wikipedia

   en.wikipedia.org/wiki/Glass_brick

   Glass brick has an r value between 1.75 and 1.96, close to that of thermopane windows. [1] [2] There are newer glass blocks injected with argon gas and having a layer of low-emissivity glass between the halves, which increases the insulative (U) value to 1.5 W/m 2 ·K, which is between triple glazed windows (1.8 W/m 2 ·K) and specialty double ...