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Glass and Glass-Ceramic Mirror Blanks
  • blank A piece of glass, quartz or other transparent material formed roughly by molding or cutting into the approximate shape and size of the finished part.
  • mirror blank The material on which the reflecting coating for a given mirror design is applied. It may be glass, quartz, Cer-Vit or metal. The thickness must be adequate to prevent distortion of the surface under gravity, and a low thermal expansion combined...
  • optical blank A casting consisting of an optical material molded into the desired geometry for grinding, polishing or, in the case of optical waveguides, drawing to the final optical-mechanical specifications.
  • glass-ceramic A type of glass used in telescope mirrors, formed by adding a nucleating agent to standard glass and then heating it until it crystallizes.
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