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Old July 16 2013, 09:21 PM   #10
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Re: Bill Gates invents transparent aluminium!

Like I said, alumina is also called emery. As in emery boards. It's the stuff we use to file our nails. It's a common but very hard substance, and that means that alumina-based glass and ceramics can be much stronger and more durable than silica-based glass and ceramics, which is why it's useful for things like vehicle armor and durable watch faces.
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