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2. R-value (insulation) - Wikipedia

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

   Installed faced fiberglass batt insulation with its R-value visible (R-21) [1]. The R-value is a measure of how well a two-dimensional barrier, such as a layer of insulation, a window or a complete wall or ceiling, resists the conductive [2] flow of heat, in the context of construction. [3]

3. Talk:R-value (insulation) - Wikipedia

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

   Dubious. The R-values cited for window glass are dominated not by conductivity but by the convective barrier due to natural convection at the air surface. Therefore R-value is not defined only in terms of conduction. QED. Furthermore, windows with 'low emissivity' coatings are given higher R-values. Hence radiation is also encapsulated by R-value.

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7. Poly(methyl methacrylate) - Wikipedia

   en.wikipedia.org/wiki/Poly(methyl_methacrylate)

   It filters ultraviolet (UV) light at wavelengths below about 300 nm (similar to ordinary window glass). Some manufacturers [19] add coatings or additives to PMMA to improve absorption in the 300–400 nm range. PMMA passes infrared light of up to 2,800 nm and blocks IR of longer wavelengths up to 25,000 nm.