| Macor
(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 |  | 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 | | 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 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. Back to top
Engineering Properties* | 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 | — | — | | 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) | 12.6 | (7.0) | | Specific Heat | J/Kg•°K (Btu/lb•°F) | 790 | (0.19) | | Electrical | | | | | Dielectric Strength | ac-kv/mm (volts/mil) | 40 | (1000) | | Dielectric Constant | @ 1 kHz | 6.0 | (6.0) | | Dissipation Factor | — | — | — | | Loss Tangent | @ 1 kHz | .005 | (.005) | | Volume Resistivity | ohm•cm | >1014 | (>1014) | *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. Back to top Standard Products | Custom Products and Services | Case Studies | Materials
Design Notes | Working Together | Vision | Contact Us | Site Map 1-908-213-7070 ©2002 Accuratus Site Design M. Adams | 
