The W1242–Clearceram 2″ dia × 5 mm thick optical blank is precision-cut from ultra-low thermal expansion CLEARCERAM®-Z glass-ceramic, offering exceptional dimensional stability, low expansion over temperature changes, and excellent surface quality. Its 2-inch diameter and 5 mm thickness make it ideal as a substrate or test piece in precision optics, metrology, interferometry, and other high-accuracy engineering applications where thermal consistency and material stability are essential.