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[Active Glasses] ZERODUR® [1] 
ZERODUR® is a glass ceramic that was developed by the SCHOTT research laboratories for applications requiring a near-zero coefficient of thermal expansion over a fairly wide temperature range. It is a homogeneous material that exhibits practically no measurable variations in its thermal and mechanical properties. It possesses exceptional longterm dimensional stability. Because ZERODUR® is transparent, its internal quality can be measured to meet your specifications.
Active & Passive Laser Glasses: SCHOTT Advanced Optics | SCHOTT North America
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