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Ceramic Properties - Sapphire
The advantages of sapphire as a design material are numerous. Extremely high use temperature, hardness, optical clarity, flexural strength, and chemical resistance make this an increasingly popular choice. Applications include grocery store scanner windows, watch glasses, and countless semiconductor and aerospace/military applications.
Properties Units Test Value Physical Chemical Formula a-Al2O3 Density, r g/cm3 ASTM C20 3.97 Color white/ transparent Crystal Structure trigonal Water Absorption % @R.T. ASTM C373 0.0 Hardness Moh's 9 Hardness knoop (kg/mm2) Knoop 100g 2200 Mechanical Compressive Strength MPa @ R.T. ASTM C773 2000 Tensile Strength MPa @ R.T. ACMA Test #4 250 - 400 Modulus of Elasticity
(Young's Mod.)GPa ASTM C848 250 - 400 Flexural Strength (MOR) MPa @ R.T. ASTM F417 760 - 1035 Poisson's Ratio, u ASTM C818 0.29 Fracture Toughness, KIc MPa x m1/2 Notched Beam Test 1.89 Thermal Max. Use Temperature
(* denotes inert atm.)C No load cond. ~2000 Thermal Shock Resistance DT (C) Quenching 200 Thermal Conductivity W/m-K @ R.T. ASTM C408 40 Coefficient of Linear Thermal Expansion, al mm/m-C (~25C through 1000C) ASTM C372 7.9 - 8.8 Specific Heat, cp cal/g-C @ R.T. ASTM C351 0.18 Electrical Dielectric Constant 1MHz @ R.T. ASTM D150 9.3 - 11.4 Dielectric Strength kV/mm ASTM D116 15 - 50 Electrical Resistivity Wcm @ R.T. ASTM D1829 1017
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