▼ Introduction of Macor Grade Machinable Glass Ceramic
Macor Grade Machinable Glass Ceramic from UNIPRETEC is a white, odorless, porcelain-like (in appearance) material composed of approximately 55% fluorophlogopite mica and 45% borosilicate glass. Machinable glass ceramic is a new class of ceramic material which is capable of being machined to precise tolerances using conventional metal-working tools and equipment. There are a number of useful machining techniques which are pertinent to this material.
▼ Features of Macor Grade Machinable Glass Ceramic
√ high use temperature (800°C continuous; 1,000°C peak);
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√ low thermal conductivity and it is a useful high temp. insulator;
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√ it can be thick or thin film metallized, brazed, epoxy and frit bonded;
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√ it is strong and rigid. It unlike high temperature plastics will not creep or deform;
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√ it is radiation resistant and plays a key role in nuclear applications and nuclear-related R&D;
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√ it is white and can be highly polished. It is the perfect material for medical and optical devices;
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√ excellent electrical insulator and it is used throughout the semiconductor and electronic industries;
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√ no porosity and when properly baked, it will not outgas. It is widely used in ultra high vacuum applications;
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▼ Material Properties of Machinable Glass Ceramic
ITEM
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UNIT
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Value
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Main Content
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-
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SiO2 + MgO + Al2O3 + K2O + B2O3 + F
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Color
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-
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White
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Density
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g/cm3
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2.35 - 2.40
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Apparent Porosity
|
%
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0.069
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Mohs Hardness
|
-
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4 - 5
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Compressive Strength (25 °C)
|
Mpa
|
510
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Flexural Strength (25 °C)
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Mpa
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90
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Thermal Conductivity (25 °C)
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W/m.K
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1.43
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Max. Using Temperature
|
°C
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1,000
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Continuous Using Temperature
|
°C
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800
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Thermal Expansion Coefficient (25 - 1,000 °C)
|
10-6/K
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7.4
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Electrical Resistivity (20 °C)
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Ω·cm
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9.0 x 1013
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Electrical Resistivity (200 °C)
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Ω·cm
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5.9 x 1010
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Electrical Resistivity (500 °C)
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Ω·cm
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2.3 x 108
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Dielectric Constant (1 MHz)
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-
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5.7
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Dielectric Strength (25 - 1,000 °C)
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KV/㎜
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43
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Tangent of Dielectric Lose Angle
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-
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4.0 x 10-3
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Chemical Stability (1:9 HCI, 1 hour)
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mg/cm2
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5.84
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Chemical Stability (10% NaOH, 1 hour)
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mg/cm2
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12.40
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∆ The data is offered for reference, exact data will vary depending on manufacturing method & part configuration.