1. Therefore, for any opaque object, emissivity is the opposite (reciprocal) of reflectivity, and Emissivity + Reflectivity = 100%. From UV to infra-red, aluminium is an excellent reflector of radiant energy. The same properties of reflectivity makes aluminium ideal as an insulating material to protect against the sun’s rays in summer, while insulating against heat loss in winter. Subtracting reflectivity from both sides of the equation, 100% - % Reflected = Emissivity. Introduction Aluminium and its alloys belong among the most frequently used metals of these days. Similarly, for translucent objects, Emissivity + Reflectivity + Transmission = 100%. 4 and Table 1)[14, 22]. This is related to their high damping constant, … A. D. Rakić. David Wang ACM Reearch, Inc. - … Visible light reflectivity of around 80% means it is widely used in light fixtures. Reflectivity of Aluminum 2005. However, if desired, you can achieve a dull, flat, black appearance, devoid of the slightest visual sheen of any kind. 24 452 R.E. However, over time certain metals may change in reflectivity as the metals oxidize. Does anyone know the highest reflecitivity of Aluminum surface, either prepared by mechanical polishing, suptttering, or eletropolishing? Mechanical features of aluminium depend on its purity, structure, and previous mechanical and temperature processing. The protected aluminum coating … Rust resistance of aluminium increases with its purity. Key words: reflectivity, absorbance, transmittance, emissivity. An SiO2 coating is used to protect the delicate aluminum coating, making it suitable for laboratory and industrial use. 34, 4755-4767 (1995) Data [CSV - comma separated] [TXT - tab separated] [Full database record] Optical transmission calculator Opt. HUMMEL (a) Reltectivity vs conductivity Silver has a higher d.c. conductivity than aluminium (Fig. We have obtained 90% reflectiivity from sputtered Al film. For this reason, some surfaces are limited in their choices. Metals have high reflectivity, reflecting almost all wavelengths in the visible region of the spectrum. Algorithm for the determination of intrinsic optical constants of metal films: application to aluminum, Appl. Is it possible to push it to 95%? Table 2. ). Metallic Reflection. The reflectivity for aluminium in the visible and IR region is … Reflectivity (R) for silver as a function of photon energy (E) (Ref. Protected Aluminum coated mirrors are a good option for many general broadband applications.