thumb|300px|Opening of the European Extremely Large Telescope|ELT secondary mirror Zerodur blank mold containing the glass at first annealing at the [[Schott AG 4-meter blank annealing facility in Mainz, Germany.]] Zerodur is a lithium-aluminosilicate glass-ceramic manufactured by Schott AG. Zerodur has a near zero coefficient of thermal expansion (CTE), and is used for high-precision applications in telescope optics, microlithography machines and inertial navigation systems.
thumb|300px|Opening of the European Extremely Large Telescope|ELT secondary mirror Zerodur blank mold containing the glass at first annealing at the [[Schott AG 4-meter blank annealing facility in Mainz, Germany.]] Zerodur is a lithium-aluminosilicate glass-ceramic manufactured by Schott AG. Zerodur has a near zero coefficient of thermal expansion (CTE), and is used for high-precision applications in telescope optics, microlithography machines and inertial navigation systems.
== Manufacturing process ==
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).