This technical information has been contributed by
Ferro-Ceramic Grinding, Inc.

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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. Ceramic parts applications include grocery store scanner windows, watch glasses, and countless semiconductor and aerospace/military applications.

PropertiesUnitsTestValue
Physical
Chemical Formulaa-Al2O3
Density, rg/cm3ASTM C203.97
Colorwhite/ transparent
Crystal Structuretrigonal
Water Absorption% @R.T.ASTM C3730.0
HardnessMoh's9
Hardnessknoop (kg/mm2)Knoop 100g2200
Mechanical
Compressive StrengthMPa @ R.T.ASTM C7732000
Tensile StrengthMPa @ R.T.ACMA Test #4250 - 400
Modulus of Elasticity
(Young's Mod.)
GPaASTM C848250 - 400
Flexural Strength (MOR)MPa @ R.T.ASTM F417760 - 1035
Poisson's Ratio, uASTM C8180.29
Fracture Toughness, KIcMPa x m1/2Notched Beam Test1.89
Thermal
Max. Use Temperature
(* denotes inert atm.)
CNo load cond.~2000
Thermal Shock ResistanceDT (C)Quenching200
Thermal ConductivityW/m-K @ R.T.ASTM C40840
Coefficient of Linear Thermal Expansion, almm/m-C (~25C through 1000C)ASTM C3727.9 - 8.8
Specific Heat, cpcal/g-C @ R.T.ASTM C3510.18
Electrical
Dielectric Constant1MHz @ R.T.ASTM D1509.3 - 11.4
Dielectric StrengthkV/mmASTM D11615 - 50
Electrical ResistivityWcm @ R.T.ASTM D18291017

This technical information has been contributed by
Ferro-Ceramic Grinding, Inc.

Click here to find suppliers

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