High-heat-resistant refractory material. Is noncontaminating and extremely stable. Can endure multiple firings and high temperatures without breaking down. Fills inside of crowns for extra stabilization during firing cycles. Repairs cracked, pressable-ceramic cores or all-ceramic margins. Holds platinum foil in place when repairing holes in castings. Provides a temporary heat shield for temperatures up to 1925°C (3500°F).