MACOR®
Machinable Glass Ceramic Properties
(See the MACOR® section in
Standard Products for more detailed information)
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.
.Key
Properties of MACOR® Machinable Glass Ceramic |  |
Low thermal conductivity | |
Low dielectric constant | |
High electrical resistance | |
Excellent resistance to high voltage puncture | |
Easily machined | |
Hermetic with no post-machining firing required |
Typical Uses of MACOR® Machinable Glass Ceramic | |
Electrical spacers in vacuum systems | |
Thermal insulators in heated or cooled assemblies | |
High intensity lamp reflectors | |
Crystal supports | |
Laser cavity components | |
Microcircuit and photonics packaging |
General MACOR® Machinable Glass Ceramic Information
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.
Download MACOR® datasheet
Engineering Properties* of MACOR® Machinable Glass Ceramic |
MACOR® | |
Mechanical |
Units of Measure |
SI/Metric |
(Imperial) | |
Density |
gm/cc (lb/ft3) |
2.52 |
(157) | |
Porosity |
% (%) |
0 |
(0) | |
Color |
— |
white |
— | |
Flexural Strength |
MPa (lb/in2x103) |
94 |
(13.6) | |
Elastic Modulus |
GPa (lb/in2x106) |
66.9 |
(9.7) | |
Shear Modulus |
GPa (lb/in2x106) |
25.5 |
(3.7) | |
Bulk Modulus |
GPa (lb/in2x106) |
— |
— | |
Poisson’s Ratio |
— |
0.29 |
(0.29) | |
Compressive Strength |
MPa (lb/in2x103) |
345 |
(50) | |
Hardness |
Kg/mm2 |
250 |
— | |
Fracture Toughness KIC |
MPa•m1/2 |
1.53 |
— |
Maximum Use Temperature
(no load) |
°C (°F) |
1000 |
(1832) | |
Thermal | | | | |
Thermal Conductivity |
W/m•°K (BTU•in/ft2•hr•°F) |
1.5 |
(10.2) | |
Coefficient of Thermal Expansion |
10–6/°C (10–6/°F) |
9.0 |
(5.0) | |
Specific Heat |
J/Kg•°K (Btu/lb•°F) |
790 |
(0.19) | |
Electrical | | | | |
Dielectric Strength |
ac-kv/mm (volts/mil) |
45 |
(1150) | |
Dielectric Constant |
@ 1 kHz |
6.0 |
(6.0) | |
Dissipation Factor |
— |
— |
— | |
Loss Tangent |
@ 1 kHz |
.005 |
(.005) | |
Volume Resistivity |
ohm•cm |
1017 |
(1017) |
*All properties are room temperature values except as noted.
The data presented is typical of commercially available material and is
offered for comparative purposes only. The information is not to be
interpreted as absolute material properties nor does it constitute a
representation or warranty for which we assume legal liability. User
shall determine suitability of the material for the intended use and
assumes all risk and liability whatsoever in connection therewith.
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