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2. 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 ...

3. R-value (insulation) - Wikipedia

   en.wikipedia.org/wiki/R-value_(insulation)

   The R-value is the building industry term [3] for thermal resistance "per unit area." [4] It is sometimes denoted RSI-value if the SI units are used. [5] An R-value can be given for a material (e.g., for polyethylene foam), or for an assembly of materials (e.g., a wall or a window). In the case of materials, it is often expressed in terms of R ...

4. List of refractive indices - Wikipedia

   en.wikipedia.org/wiki/List_of_refractive_indices

   Plate glass (window glass) 1.52 [29] Crown glass (pure) 1.50–1.54: PETg: 1.57: Polyethylene terephthalate (PET) 1.5750: Polycarbonate: 150: 1.60 [30] Crown glass (impure) 1.485–1.755: Flint glass (pure) 1.60–1.62: Bromine: 1.661: Flint glass (impure) 1.523–1.925: Sapphire: 1.762–1.778: Boron nitride: 2–2.14 [31] Cubic zirconia: 2.15 ...

5. Insulated glazing - Wikipedia

   en.wikipedia.org/wiki/Insulated_glazing

   Vacuum Insulating Glass (VIG) units result in R-values as high as R-15 (center of glass). Combining a VIG unit with another glass pane and warm edge spacer result in R-18 (center of glass) or more depending upon the low-e coating(s). Double VIG units with warm edge spacer reach R-25 (center of glass) or more depending upon low-e coatings and ...

6. List of insulation materials - Wikipedia

   en.wikipedia.org/wiki/List_of_insulation_materials

   Typical R-values are given for various materials and structures as approximations based on the average of available figures and are sorted by lowest value. R-value at 1 m gives R-values normalised to a 1 metre (3 ft 3 in) thickness and sorts by median value of the range.

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8. Glazing (window) - Wikipedia

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

   Double-paned windows are the norm in new residential installations, as they offer substantial energy savings in comparison to single-paned glass. Each individual glass pane has poor insulation properties, with an R-value (insulation), or measure of an object's resistance to heat conduction, of 0.9. However, when two panes are placed in series ...

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   AOL Mail welcomes Verizon customers to our safe and delightful email experience!