Macor  (Machinable Glass Ceramic) is a special material,  machinable with ordinary metal working tools, holds tight tolerances, up to .0005″, withstands high temperature, up to 1000°C ( no load), is clean, no outgasing and zero porosity.


Macor  has a continuous use temperature of 800°C and a peak temperature of 1000°C. Its coefficient of thermal expansion readily matches most metals and sealing glasses.It is nonwetting, exhibits zero porosity, and unlike ductile materials, won’t deform. It is an excellent insulator at high voltages, various frequencies, and high temperatures. When properly paked out, it won’t outgas in vacuum environments.


Machining tolerances are surprisingly tight, up to .0005″. It can be machined to a surface finisc of less than 20uin. and polished to a smoothness of 0.5uin.-AA.Configurations are limited only by available equipment and the experience of the machinist.

Sealing, Joining and Metalizing

A class of Macor can also be joined or scaled – both to itself and to other materials – in a number of ways: metalized parts can be soldered together and brazing has proven an effective method of joining the material to various metals; epoxy produces a strong joint, and sealing glass creates a vacuum tight seal. Even a straight-forward mechanical joint is possible.

It can be thick film metalized using metal inks, or thin film metalized by sputtering.