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The reflectivity of dull aluminium foil is 80%, while shiny embossed foil reflects about 88%. [7] The difference in thermal properties between the two sides is imperceptible without instrumentation. By Kirchhoff's law of radiation , increased reflectivity decreases both absorption and emission of radiation.
As it is an opaque material, the remaining 10 percent must be reflected. Conversely, a low-e material such as aluminum foil has a thermal emissivity/absorptance value of 0.03 and as an opaque material, the thermal reflectance value must be 1.0 - 0.03 =0.97, meaning it reflects 97 percent of radiant thermal energy. Low-emissivity building ...
Reflective foils are fabricated from aluminum foils with a variety of backings such as roofing paper, craft paper, plastic film, polyethylene bubbles, or cardboard. Reflective bubble foil is basically a plastic bubble wrap sheet with a reflective foil layer and belongs to a class of insulation products known as radiant foils.
Aluminium foil: 0.03 Aluminium, anodized: 0.9 [18] Aluminium, smooth, polished 0.04 ... Hemispherical reflectance: R — Radiant flux reflected by a surface, ...
For more facts about aluminum foil, here’s why it has a shiny and a dull side. Americans have been using aluminum foil for over 100 years, since it was first used to wrap Life Savers, candy bars ...
A space blanket (also known as a Mylar blanket, emergency blanket, first aid blanket, safety blanket, thermal blanket, weather blanket, heat sheet, foil blanket, or shock blanket) is an especially low-weight, low-bulk blanket made of heat-reflective thin plastic sheeting. They are used on the exterior surfaces of spacecraft for thermal control ...
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