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Al2o3 ceramic plug
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Item Test Condition Unit&Symbol 95% Al2O3 99% Al2O3 99.7% Al2O3
The main chemical ingredient Al2O3 Al2O3 Al2O3
Bulk Density g/cm3 3.6 3.89 3.96
Maximum Use Temperature 1450°C 1600°C 1650°C
Water absorption % 0 0 0
ROHS Hardness ≥85 ≥89 ≥89
Flexural strength 20° C MPa (psi x 103) 358 (52) 550 550
Compressive Strength 20° C MPa (psi x 103) 2068 (300) 2600(377) 2600(377)
Fracture Toughness K(I c) Mpa m1/2 4 - 5 5.6 6
Coefficient of thermal expansion 25-1000° C 1X 10-6/°C 7.6 7.9 8.2
Coefficient of thermal conductivity 20° C W/m °K 16 30 30.4
Thermal Shock Resistance Tc °C 250 200 200
Dielectricity constant 1MHz.25°C 9 9.7 9.7
Dielectric strength ac-kV/mm (ac V/mil) 8.3 (210) 8.7 (220) 8.7 (220)
Volume Resistivity 100°C ohm-cm > 1013 > 1014 > 1014

Surface treatement: Polishing, glazed available

.Tolerance: with high precision tolerance, min. can be +/-0.01mm

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