A material that does not expand in size when material temperature increases.

is an inorganic non-porous brand of glass ceramics from SCHOTT AG. Consisting of one phase of finely distributed nanocrystallites and one residual glass phase, it provides unique features (extremely low coefficient of thermal expansion, good material homogeneity, chemical resistance, long-term stability and almost non-varying mechanical properties). Zerodur® is fabricated by controlled volume crystallization (ceramization).