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Old 04-11-2009, 11:05 AM
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Originally Posted by marki View Post
Allan, I very much doubt the mirror has an AlO3 coating. MgF2 or SiO2 yes.

Actually raw Aluminium converts to the oxide faster than you can blink. The surface of almost all aluminium is coated in the oxide as soon as it's exposed to air. So it is possible that it is coated in Al oxide. Some mirror manufacturers coat with SiO2 after the deposition which is done in an atmosphere devoid of oxygen (and all other gasses). Most don't though.

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