Please note that the information set forth herein is offered for comparison only, and is not to be construed as absolute engineering data or constituting a warranty or representation for which we assume legal responsibility.
|Property||Unit||Test||Alumina 99.5%||Alumina 99.6%||Alumina 99.8%|
|Elastic Modulus||GPa||ASTM C848||350||370||350|
|Flexural Strength||MPa||ASTM F417||375||379||360|
|Compressive Strength||MPa||ASTM C773||2500||2600||2400|
|Fracture Toughness Range||Mpa||NOTCHED BEAM||4-5||4-5||4-5|
|Thermal Conductivity||W/mK||ASTM C408||27.5||30||30|
|CTE 25-100||10(-6)/0C||ASTM C372||8.2||8.2||8.2|
|Thermal Shock||delta Tc||NOTE3||200||200||200|
|Dielectric Strength||ac-kv/mm (6.25mm)||ASTM D116||8.7||8.7||8.7|
|Dielectric Loss||250C@1MHz||ASTM D2520||0.0002||0.0001||0.001|
|Volume Resistivity||1000C ohm-cm||ASTM D1829||2×10^6||2×10^6||5×10^7|
- DATA MEASUREMENTS – All data measurements are typical and made at room temperature unless otherwise noted.
- THERMAL SHOCK RESISTANCE – Tests are run by quenching samples into water from various elevated temperatures. The change in temperature where a sharp decrease in flexural strength is observed is listed as ‘delta Tc’.
- CHEMICAL RESISTANCE – Although all alumina and zirconia ceramics are highly resistant to chemical attack, it is recommended that specific applications are discussed with Almath Crucibles to ensure optimum ceramic selection.