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Re: Ceramic Blanks

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Posted by Robert May on April 27, 1999 19:30:32 UTC

I've seen the blanks up at RTMC and they should work well. The low expansion should allow for a very stable mirror. The prices aren't too far from the price of Pyrex so it should be easy to go for it. I have no projects that need a blank at the present so I haven't tried them. BTW, are you sure that that 12" mirror is TEMPERED??? I would suspect that it would be annealed to keep the shape regular when it gets hot. Tempering a piece of glass puts it under tension and sudden heating would cause fracture at worst and annealing at the least.

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