Macor is cast as a two phase glass. After casting, it is heat treated causing crystallization of one phase giving rise to its glass-like and ceramic-like characteristics.
Macor exhibits good thermal shock resistance and mechanical toughness when compared to conventional glasses with similar thermal and mechanical properties.
Macor is usable in an air atmosphere to 1000° C. In vacuum systems, where the temperature exceeds 600° C, fluorine evolution will occur manifesting itself as boron trifluoride or hydrofluoric acid.
Macor is attacked by halogen acids at elevated temperatures. It is significantly more resistant to NaOH. Alkali salts have a negligible corrosion effect.
Macor is easily machined using standard metal working tools. It is fully dense and hermetic requiring no firing after machining to develop it’s physical properties. Tolerances of less than 10 microns (.0005") are easily maintained.