Machinable Ceramics

Machinable ceramics, also known as glass-ceramics, are mica-based glass-ceramic materials with synthetic mica as the primary crystalline phase. These materials offer excellent machinability, vacuum performance, electrical insulation properties, high-temperature resistance, and chemical corrosion resistance.

index	Standard Value	Description
Density	2.7 g/cm³
Apparent Porosity	0.10%
Water Absorption	0.038
Hardness	4 ~ 5	Mohs Scale
Color	Pure White
Coefficient of Thermal Expansion	86 x 10-7/°C	Average Value from 100°C ~ 600°C
Thermal Conductivity	1.68W/mk	25°C
Continuous Service Temperature	800°C
Flexural Strength	108Mpa
Compressive strength	488Mpa
Impact Toughness	> 2.56KJ/m²
Young's Modulus	65GPa
Dielectric Loss	1 ~ 4 x 10-3	Room Temperature
Dielectric Constant	6 ~ 7	Room Temperature
Dielectric Strength	> 40KV/mm	Sample Thickness 1mm
Volume Resistivity	1.08 x 1014Ω.cm	25°C
	1.5 x 1010	200°C
	1.1 x 107	500°C
Outgassing Rate at Room Temperature	8.8 x 10-9 m1/s. cm²	Vacuum aging for 8 hours
Helium Permeability Rate	1 x 10-10m1/s	After firing at 500°C and cooling to room temperature
5%HC1	0.26mg/cm²	95°C, 24 hours
5%HF	83mg/cm²	95°C, 24 hours
50%Na2CO3	0.012mg/cm²	95°C, 24 hours
5%NaOH	0.85mg/cm²	95°C, 24 hours

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