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Elmet Technologies

Crystex Composites Mykroy/Mycalex MM 800 Machining Grade Glass-bonded Mica Composite
Categories: Ceramic; Glass; Glass Ceramic; Machinable Ceramic

Material Notes: MM 800 (formerly MM 1600) is a compression molded glass mica composite that is the perfect alternative to high performance plastics where high temperature, good dielectric strength and good arc resistance are required. This material is softer than other high temperature machinable ceramics allowing for the fabrication of intricate or complex shapes. It can be drilled or tapped and can accommodate helical inserts. In addition, no post firing is required after fabrication.

Product Benefits:

  • Higher operating temperature
  • Exceptional dimensional stability
  • High compressive strength
  • Higher thermal shock resistance
  • Completely inorganic
  • Does not burn or outgas
  • Impervious to moisture, oils, and gases
  • Withstands thermal cycling
  • Low thermal conductivity
  • High dielectric strength
  • Low electrical loss
  • High arc resistance
  • Vacuum tight
  • Can be glued with epoxy, sealing glass, or ceramic adhesives
  • Synthetic Mica Filler
Glass bonded mica specification ASTM D1049.

Typical data below provided by Mykroy/Mycalex Ceramics.

Key Words: Glass Bonded Mica
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Physical PropertiesMetricEnglishComments
Density 2.74 g/cc0.0990 lb/in³
Water Absorption 0.00 %0.00 %
 
Mechanical PropertiesMetricEnglishComments
Hardness, Rockwell A 4747
Hardness, Rockwell H 9090
Tensile Strength at Break 41.4 MPa6000 psi
Modulus of Elasticity 79.3 GPa11500 ksi
Flexural Strength 93.1 MPa13500 psi
Compressive Strength 276 MPa40000 psi
Izod Impact, Notched 0.961 J/cm1.80 ft-lb/in
 
Electrical PropertiesMetricEnglishComments
Volume Resistivity 2.60e+15 ohm-cm2.60e+15 ohm-cm
Surface Resistivity per Square 5.00e+13 ohm
@Temperature 25.0 °C
5.00e+13 ohm
@Temperature 77.0 °F
Dielectric Constant 6.91
@Frequency 1e+6 Hz
6.91
@Frequency 1e+6 Hz
Dielectric Strength 18.9 kV/mm480 kV/in
Dissipation Factor 0.0030
@Frequency 1e+6 Hz
0.0030
@Frequency 1e+6 Hz
Dielectric Loss Index 0.0207
@Frequency 1e+6 Hz
0.0207
@Frequency 1e+6 Hz
Arc Resistance 300 sec300 sec
 
Thermal PropertiesMetricEnglishComments
CTE, linear  9.00 µm/m-°C
@Temperature 25.0 °C
5.00 µin/in-°F
@Temperature 77.0 °F
 10.46 µm/m-°C
@Temperature 350 °C
5.811 µin/in-°F
@Temperature 662 °F
 10.69 µm/m-°C
@Temperature 500 °C
5.939 µin/in-°F
@Temperature 932 °F
 15.81 µm/m-°C
@Temperature 750 °C
8.783 µin/in-°F
@Temperature 1380 °F
Specific Heat Capacity 0.874 J/g-°C0.209 BTU/lb-°F
Thermal Conductivity 1.02 W/m-K7.08 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air 800 °C1470 °FContinuous
 
Descriptive Properties
ColorOff White

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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