Macor ® is a machinable glass ceramic made by Corning Incorporated, distributed and fabricated by Astro Met.
It is available in rod, bar, and sheet stock shapes, or as precision
fabricated parts in production or prototype quantities.
Machinable with ordinary metalworking tools
High dielectric strength
Superior vacuum tightness
Strong and dimensionally
Useful to 1000°C, 1800°F
Good chemical resistance
Macor is a machinable glass-ceramic material with a unique combination
of useful properties. A product of Corning Incorporated, it is stocked,
distributed and fabricated by Astro Met, Inc.
High dielectric strength makes Macor
an excellent insulator. No out-gasing, essentially zero porosity and
low helium permeation make it useful in vacuum applications. Because
it is thermally stable and has thermal expansion characteristics similar
to metals, it can be used where high heat and flame are problems. It
can be sealed, metallized and brazed.
Macor can be turned, milled, drilled,
tapped, sawed and ground by ordinary metalworking tools and techniques.
It is machined with high-speed steel or, more easily, with carbide tooling
at relatively low speeds and feeds, but with greater depth of cut than
is usual with metals. Use of a water-soluble coolant is recommended.
The "chips" are a fine powder, easily controlled by coolant
Because Macor is so readily machined,
it is a cost effective material for small volume manufacturing and for
developing ceramic prototypes which in production are made by pressing
and sintering large quantities. It has been used for nozzles, sensor
housings, bearings, fixtures, guides, electrical insulators, thermal
isolators and numerous other applications where the unique technical
properties of Macor provide a solution to a challenging materials problem.
Astro Met manufactures such parts to customer specifications (with tolerances
as tight as .0005") and is able to provide limited prototype components
as well as production quantities.
Astro Met, Inc.
9974 Springfield Pike
Cincinnati, OH 45215