Alumina Oxide 85% to 99.9%

Alumina is a chemically resistant material and has the ability to withstand very high temperatures in aggressive environments. Alumina 96% is an excellent overall substrate material for cost effective manufacturing and laser processing.

Available sizes of Alumina substrates

Material Specifications
Physical Properties Units Test 85% 94% 96% 99.5% 99.8% 99.9%
Chemical Formula   -            
Density g/cm³ ASTM C20 3.42 3.7 3.72 3.7-3.97 3.8-3.9 3.93
Color - -   white white ivory/white ivory  
Crystal Structure - -       hexagonal    
Water Absorption % ASTM C373 0.0 0.0 0.0 0.0   0.0
Hardness Moh's -   9 9 9    
Hardness Knoop
(kg/mm1)		 Knoop 100g   2000   2000   2000
Mechanical Properties Units Test 85% 94% 96% 99.5% 99.8% 99.9%
Compressive Strength psi
MPa		 ASTM C773 1930 2103 2068 2070-2620 2300  
Tensile Strength psi
MPa		 ACMA TEST# 4 155 193 221 260-300    
Modulus of Elasticity
(Young's Mod.) 		psi x 106
GPa		 ASTM C848   41-46 x 106 psi 44-331 394   55 x 106 psi
Flexural Strength psi
MPa		 ASTM F417 296 352 400 310-379 310 50-60
Poisson's Ratio - ASTM C818 0.22 0.21 0.25 0.27   0.19
Fracture Toughness MPa x m1/2 Notched Beam 3-4 4-5 4-5 4-5   4-5
Thermal Properties Units Test 85% 94% 96% 99.5% 99.8% 99.9%
Max. Use Temperature
(* denotes insert atm.) 		°C No Load Cond. 1400 1700 1700 1750   1900
Thermal Shock Resistance DT (ºC) Quenching 300 300 250 200   200
Thermal Conductivity W/m.K ASTM C408 16 18.0-28.0 26 35 25 341
Coefficient of Linear
Thermal Expansion 		µm/m-°C
(~25°C though +/- 1000°C)		 ASTM C372 7.2 8.2 8.2 8.4   7.6 106
Specific Heat cal/g/°C ASTM C351   0.21   0.21   0.2
Electrical Properties Units Test 85% 94% 96% 99.5% 99.8% 99.9%
Dielectric Constant 1Mhz @ R.T. ASTM D150 8.2 9.3 9.0 9.6   9.8
Dielectric Strength V/mil
kV/mm		 ASTM D116 9.4 (240 acV/mil) 8.3 8.3 (210 ac/Vmil) 15.0   (230 acVmil)
Electrical Resistivity Wcm @ R.T. ASTM D182           1014

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