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Beryllium Oxide (BeO) is a space age technical ceramic material that offers a combination of desirable properties not found in any other material. Distinguished by excellent high heat and thermal conductivity, it retains dielectric constant, loss factor and dielectric strength in the range of most electrical insulators. Along with good mechanical strength and stiffness to weight ratios, this unique combination of properties provides designers with a material that can reduce the size of heat generating circuitry while retaining essential high power capability and improved thermal stability.
Typical applications include heat sinks in high power electronics and semiconductors, and use as a heat dissipation medium in a wide range of miniaturized circuitry applications in the defense, aerospace and commercial markets.
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Properties of Beryllium (BeO) Oxide
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Material Property
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Qualified Value
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Test Method
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ELECTRICAL
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| Dielectric Constant |
6.6 at MHz
6.7 at 10 GHz
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ASTM-D150
ASTM-D2520
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| Dissipation Factor |
.0003 to 2 MHz
.0009 to 10 GHz
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ASTM-D150
ASTM-D2520
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| Resistivity |
1015 ohm-cm
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ASTM-D257
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| Dielectric Strength |
300 volts/mil (1/8" thick)
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ASTM-D149
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THERMAL
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| Thermal Conductivity |
265 w/m°k
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ASTM-C408
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| Thermal Expansion |
8.0 x 10-6 in/in ºC (25ºC to 1000C)
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ASTM-C539
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| Maximum Continuous Use Temperature |
1800ºC
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| Thermal Shock Resistance |
Excellent
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MECHANICAL (MPa - Mega Pascals GPa - Giga Pascals)
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| Flexural Strength |
35,000 psi (242 MPa)
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ASTM-D2442
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| Tensile Strength |
20,000 psi (138 GPa)
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ASTM-D539-84138 GP
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| Compressive Strength |
225,000 psi (1.55 GPa)
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ASTM-C773
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| Young’s Modulus |
50 x 106 psi (345 GPa)
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ASTM-C623
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| Shear Modulus |
25 x 106 psi (173 GPa)
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ASTM-C623
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| Poisson’s Ratio |
0.26
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ASTM-C623
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PHYSICAL
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| Density |
2.85 gm/cc, min.
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ASTM-C373
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| Hardness |
60 on Rockwell 45N
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ASTM-E18
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| Permeability, Liquid |
Impervious
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ASTM-D116
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| Permeability, Gas |
Impervious
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Helium Detecting Mass Spectrograph Set at 10-8 atm cc/sec
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| Average Grain Size |
15 Microns
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Linear Intercept
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| Color |
White
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Visual
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| Impact Resistance |
6 in. –lbs
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ASTM-D256-R83
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| Surface Finish |
As Fired: 10-20 micro-inch
As Lapped: 5 micron., min
As Ground: To Customer spec.
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Dektak II
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Available Ceramic Shapes and Sizes
| Discs (Diameter in Inches) |
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.074
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.190
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.375
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.732
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.084
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.247
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.431
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.760
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.109
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.278
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.437
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1.050
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.116
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.284
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.466
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1.596
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.123
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.300
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.494
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1.617
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.173
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.339
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.500
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2.530
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.183
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.370
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.625
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3.020
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| Rectangles (Length x Width in Inches) |
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.244 x .244
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.366 x .148
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.503 x .353
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.700 x .350
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.246 x .246
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.370 x .370
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.504 x .307
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.750 x .245
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.250 x .250
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.375 x .250
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.506 x .354
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.900 x .900
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.300 x .300
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.380 x .350
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.544 x .514
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.939 x .871
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.346 x .346
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.394 x .364
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.609 x .609
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1.000 x .625
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.350 x .350
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.397 x .397
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.633x .139
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1.000 x 1.000
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.364 x .269
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.494 x .245
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.649 x .649
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1.176 x 1.176
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1.243 x 1.243
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1.690 x .997
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2.000 x 1.640
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1.261 x .282
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1.800 x 1.000
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2.040 x .405
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1.345 x .740
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1.947 x .741
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2.150 x 2.150
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Please Note: The above discs and rectangles can be manufactured to any thickness between .020 inches and 0.70 inches. Tooling also exists for washers, discs with flats, and standard heat sink configuration. Please contact our Sales Department regarding thinner or thicker sizes and any other shapes you may require
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