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

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Ceramic Properties - Mullite

Mullite is an excellent structural ceramic parts material due to its high temperature stability, strength and creep resistance. It has a low dielectric constant and high electrical insulation capabilities.

Typical applications include Kiln Furniture, furnace center tube, heat exchange parts, heat insulation parts, and rollers.

PropertiesUnitsTestValue
Physical
Chemical Formula3Al2O3-SiO2
Density, rg/cm3ASTM C202.80
Colortan
Crystal Structureorthorhombic
Water Absorption% @R.T.ASTM C3730.0
HardnessMoh's8
Hardnessknoop (kg/mm2)Knoop 100g1450
Mechanical
Compressive StrengthMPa @ R.T.ASTM C773551
Tensile StrengthMPa @ R.T.ACMA Test #4103.5
Modulus of Elasticity
(Young's Mod.)
GPaASTM C848150
Flexural Strength (MOR)MPa @ R.T.ASTM F417170
Poisson's Ratio, uASTM C8180.25
Fracture Toughness, KIcMPa x m1/2Notched Beam Test2.0
Thermal
Max. Use Temperature
(* denotes inert atm.)
CNo load cond.1700
Thermal Shock ResistanceDT (C)Quenching300
Thermal ConductivityW/m-K @ R.T.ASTM C4083.5
Coefficient of Linear Thermal Expansion, almm/m-C (~25C through 1000C)ASTM C3725.3
Specific Heat, cpcal/g- @ R.T.ASTM C3510.23
Electrical
Dielectric Constant1MHz @ R.T.ASTM D1506.0
Dielectric StrengthkV/mmASTM D1169.8
Electrical ResistivityWcm @ R.T.ASTM D18291013

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

Click here to find suppliers

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