Alumina Datasheet

Our Alumina components (UK)

Alumina components can be produced in a range of purities with additives designed to enhance properties. A wide variety of ceramic processing methods can be applied including machining or net shape forming to produce a wide variety of sizes and shapes of component. In addition it can be readily joined to metals or other ceramics using metallising and brazing techniques.

Alumina components are by far the largest range of uk alumina products made by Advanced Ceramic Engineering. Due to the important combination of properties, we have thoroughly researched the behaviour and characteristics of our Alumina components to give you the best possible alumina components.

Alumina Datasheet

 

PropertyUnitUL-500UL-600UL-300UL-995UL-995 (Fine grain)UL-1009
AL203%94.096.097.699.599.599.85 min
Flexural Strength Ibf/in²50,000 “53000″43,00045,00023,000
 MN/m²350370300315160
Compressive Strength Ibf/in²>300,000>300,000>250,000>300,000>100,000
 MN/m²>2,1002,1001,7502,100690
Bulk Specific Gravity3.64-3.673.69-3.723.73-3.763.84-3.873.84-3.873.0-3.2
Porosity%water absorptionVacuum tight – 0.00Vacuum tight – 0.00Vacuum tight – 0.00Vacuum tight – 0.00Vacuum tight – 0.00porous 6.0-7.0
ColourWhiteWhiteWhiteWhiteWhiteWhite
HardnessRockwell 45N7879758181
Thermal Conductivitycal/cm²/cm/sec/°C0.0490.0510.0640.0700.038
 W/m/K20.525.526.829.315.9
Coefficient of Linear expansion       
#8211; 25 degrees #8211; 200 degrees °Cper°C (X10⁻⁶)6.36.46.96.9
#8211; 200 #8211; 400 degrees °Cper°C (X10⁻⁶)7.57.67.87.8
#8211; 400 #8211; 600 degrees °Cper°C (X10⁻⁶)8.08.28.58.3
#8211; 600 #8211; 800 degrees °Cper°C (X10⁻⁶)8.68.78.89.0
#8211; 800 #8211; 1000 degrees °Cper°C (X10⁻⁶)9.19.09.09.4
Maximum working temperature/°C160016201650172517251800
Dielectric strengthD.C volts/mil. (0.100² thick-under oil)6506751100800
 KV/mm25264331
Te Value/°C>950>950>1000>975>1000
Volume Resistivity      
25 degrees °COhm-cm1014>1014>10141014>1014
300 degrees °COhm-cm2.0×10122.0×10121.0×10122.0×10117.0×1011
600 degrees °COhm-cm4.6×1045.2×1082.3×10206.0×1081.2×1010
900 degrees °COhm-cm3.5×1044.1×1085.0×1082.5×1061.6×108
PropertyUnitUL-500UL-600UL-300UL-995UL-1009
Dielectric Constant10😉25°C 300°C 500°C25°C 300°C 500°C25°C 300°C 500°C25°C 300°C 500°C200°C 
10 MHz10😉9.07 | 9.53 | 9.919.30 | 9.65 | 10.109.53 | 9.91 | 10.149.58 | 9.92 | 10.20
1000MHz10😉9.04 | – | –9.20 | – | –9.00 | – | –9.30 |  – | –
8500MHz10😉8.98 | 9.26 | 9.409.16 | 9.30 | 9.459.04 | 9.32 | 9.549.37 | 9.61 | 9.827.07
Dissipation Factor(Tanδ)25°C 300°C 500°C25°C 300°C 500°C25°C 300°C 500°C25°C 300°C 500°C200°C
10MHz(Tanδ)0.00026 | 0.00028 | 0.003410.00030 | 0.00061 | 0.003300.00004 | 0.00016 | 0.000520.00003 | 0.00009 | 0.00040
1000MHz(Tanδ)0.00062 | – | –0.00044 | – | –0.00030 | – | –0.00014 | – | –
8500MHz(Tanδ)0.00078 | 0.00115 | 0.001550.00062 | 0.00085 | 0.001210.00045 | 0.00040 | 0.000720.0009 | 0.00014 | 0.000250.00011
Loss Factor25°C 300°C 500°C25°C 300°C 500°C25°C 300°C 500°C25°C 300°C 500°C200°C
10 MHz0.00236 | 0.00267 | 0.033690.00279 | 0.00588 | 0.033330.00038 | 0.00158 | 0.005270.00029 |0.00069 |0.00408
100MHz0.00560 | – | –0.00405 | – | –0.00270 | – | –0.00130 | – | –
8500MHz0.00700 | 0.01165 | 0.014570.0588 | 0.00719 | 0.011430.00407 | 0.00973 | 0.006870.0084 | 0.00135 | 0.002450.00075

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