MACOR^®
Machinable Glass Ceramic MGC

Special Properties

• Odorless, opaque white material
• Machinable glass ceramic
• High temperature resistance
• Non-porous
• Dimensionally stable
• Non outgassing
• Good insulator

Typical Applications

• Flight and Aerospace Applications
• Substrates for Field Ion Microscopes
• Ultra High Vacuum Applications
• Medical Applications
• High Temperature Applications
• High Precision Applications

Fig.: Finished component made of Macor machinable glass ceramic (MGC)

MACOR^® machinable glass ceramic is a white, odorless material with exceptional properties. The opaque MGC glass ceramic from Corning allows a quick and a precise manufacturing of complex workpieces. A high continuous use at temperature of 800°C and a peak temperature of up to 1.000°C of Macor machinable glass ceramic opens up a wide variety of interesting applications. Macor has zero porosity and is nonwetting. The machinable glass ceramic does not deform and is not outgassing which allows the use in vacuum environments. Macor MGC is an excellent insulator at high voltages and various frequencies even at high operating temperatures.

Specifications of MACOR
Machinable Glass Ceramic MGC*

 

Density

• 2,52 g/cm³

Coefficient of Thermal Expansion

• 74 x 10^-7 / °C (-200 - 25°C)
• 93 x 10^-7 / °C (25 - 300°C)
• 114 x 10^-7 / °C (25 - 600°C)
• 126 x 10^-7 / °C (25 - 800°C)

Thermal Properties

• Continuous operating temp. : 800°C
• Max. operating temperature : 1.000°C (no load)
• Thermal Diffusivity (25°C) : 7,3 x 10^-7 m2 / s
• Thermal Conductivity (25°C) : 1,46 W/m°C
• Specific Heat (25°C) : 0,79 KJ / kg°C

Mechanical Properties

• Porosity : 0%
• Young's Modulus (25°C) : 66,9 GPa
• Poisson's Ratio : 0,29
• Shear Modulus (25°C) : 25,5 GPa
• Knoop Hardness (100g) : 250
• Modulus of Rupture (25°C) : 94 MPa
• Compressive Strength : 345 MPa
• Fracture Toughness : 1,53 MPa m^0,5

Electrical Properties

• Dielectric Constant (25°C) : 6,03 (1 KHz)
• Dielectric Loss Tangent (25°C) : 4,7 x 10^-3 (1 KHz)
• Dielectric Strength (25°C) : 40 KV / mm (at 0,254mm thickness)
• Volume Resistivity : >10¹⁶ Ω-cm

Macor machinable glass ceramic even allows the manufacturing of very small and complex parts with a high precision. If you have any technical question, please just contact us.

Chemical Properties
Medium	pH	Time (h)	Temp. (°C)	Weight loss (mg/cm2)
5% HCL	0,1	24h	95°C	ca. 100
0,002 N HNO3	2,8	24h	95°C	ca. 0,6
0,1 N NaHCO3	8,4	24h	95°C	ca. 0,3
0,02 N Na2CO3	10,9	6h	95°C	ca. 0,1
5% NaOH	13,2	6h	95°C	ca. 10
H2O (water)	7,6	24h	95°C	ca. 0,01

MACOR Machining Specifications

• Follow this link to the machining specifications

*Please consider the "Notes on technical specifications"


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