Silvering is the chemical process of coating a non-conductive substrate such as glass with a reflective substance, to produce a mirror. Log in. 0000011744 00000 n link In 1835 German chemist Justus von Liebig developed a process for depositing silver on the rear surface of a piece of glass; this technique gained wide acceptance after Liebig improved it in 1856. 0000003316 00000 n ��H��L�wJs՞͗���:*��E��V^���l�s@-��[Oh:ʒ��r��6�M�nC�RRIKK�@a6l��@�&���5��% L�w�@��I0�@l�b�c�``�u(f��������\�����L��".�+���� ��;����N�V�z`��@|��k#t-�.͟�u�*�����\cl���v0s``� ���YFf��Rb�(����@��8�d�1���b@�L ���!�� � Q^}� endstream endobj 270 0 obj<>/StructTreeRoot 22 0 R/Metadata 267 0 R/MarkInfo<>>> endobj 272 0 obj<>/ProcSet[/PDF/Text]/ExtGState<>>>/StructParents 0>> endobj 273 0 obj[326 0 R] endobj 274 0 obj<> endobj 275 0 obj<> endobj 276 0 obj<> endobj 277 0 obj<> endobj 278 0 obj<>stream R��4� i�BZC+�tE��d��I�4y�. %PDF-1.3 %���� Click here to get an answer to your question ️ Why silver is used in making mirrors? Some mirror makers evaporate a layer of quartz or beryllia on the mirror; others expose it to pure oxygen or air in an oven so that it will form a tough, clear layer of aluminum oxide. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful. "text": "#237afc" How Google uses data when you visit this site. The problem is aluminum oxidizes very quickly. Regards. A. How much will reflectivity drop from adding protective SiO2 coating? We produce the silver mirror, I don't know the exact difference between the silver mirror and aluminium mirror, but I know the aluminium mirror is usually made by the sheet glass, the silver mirror are made by the float glass. Most folks try to avoid pools of mercury these days! Q. I want to thank you on the best answer I have found online about how to tell silver from aluminum. I will be thankful to you if you provide me the process of aluminium mirrors. Regards. 0000039000 00000 n Silver does have a higher optical reflectivity than aluminum, but it also reflects UV light poorly. Search the site A mirror with a simple dielectric overcoat is called a protected metal mirror. 8 mirror finish 304/316: R60% too low for solar concentration but durable, probably best for application not requiring high reflectivity. High cost, not suitable for low-cost system. A. If aluminum is not as durable, then why do most astronomical telescopes (including observatory based ones) use aluminum coating on their primary mirrors? } 0000010510 00000 n It is extremely hard to separate the aluminum oxide from the metal, and if the mirror is scratched, a new protective layer of oxide will reform immediately. Most are multi-layer and depend on the desired use - optical quality reflectivity, illumination reflectivity, IR, UV, etc. The possibilities strike me as utterly limitless. Please respond if you think this is an appropriate answer. 5 }, 0000060362 00000 n 0000056078 00000 n from Abe Books A. 0000032248 00000 n 0000006431 00000 n 5, has a good introductory chapter on "Cleaning and Finishing of Aluminum and Aluminum Alloys". The most common methods in current use are electroplating, chemical "wet process" deposition, and vacuum deposition. Most common household mirrors are "back-silvered" or "second-surface", meaning that the light reaches the reflective layer after passing through the glass. 0000060010 00000 n Household mirrors are coated on the back while mirrors used in optical applications feature front-surface mirrors. 0000050046 00000 n We are professional mirror manufacturer in Qingdao, China Q. IS THERE ANY NEW FLEXIBLE REFLECTIVE MIRROR OF SUCH TYPE? For the application of silver to a metal surface using mercury, see, "Daily events and images of the installation of the BBSO New Solar Telescope", "The Origins of Mirrors and their uses in the Ancient World", "Historic Mercury Amalgam Mirrors: History, Safety and Preservation", "Ueber die Producte der Oxydation des Alkohols", "Ueber Versilberung und Vergoldung von Glas", "English Patents of Inventions, No. Sincerely. "The Surface Treatment of Aluminum and Its Alloys" has more data than you'll probably ever have time to read: super purity aluminum with 2% magnesium added can give excellent reflectivity (about 85%) even with a durable 0.0002" - 0.0004" anodizing layer, and even more if bare or with a thin anodized layer. A. I had a number of sextant mirrors recoated last year. 0000014136 00000 n Join now. 0000004581 00000 n 0000002226 00000 n 4 A more complicated coating can be used to increase the reflectance of a metal mirror. window.cookieconsent.initialise({ 0000003808 00000 n 0000002714 00000 n - Silver must be coated on glass, R90% highest reflectivity and good protection for outdoor application if properly sealed. A common overcoat material for visible mirrors is silicon monoxide (SiO). regards How much silver is used in the making of a mirror (lets say per sq foot or sq meter or how ever the industry measures it) and how pure is the silver that is used? The silver coating is done by reducing Silver Nitrate of very high purity of around 99.95%. 0000007485 00000 n If you have one of these types of antique mirror, it probably has white stains of tin oxide in it and a pretty pool of mercury at the bottom as the amalgam disintegrates. I don't know enough about the SiO2 coating to answer your question, but the traditional coating is a thin layer (0.00008" or so) of anodizing. & Install'nChemicals & Consumables The coated surface (glass) must be extremely clean and flat. In a vacuum, the hot aluminum atoms travel in straight lines.

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