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.
Properties Units Test Value Physical Chemical Formula 3Al2O3-SiO2 Density, r g/cm3 ASTM C20 2.80 Color tan Crystal Structure orthorhombic Water Absorption % @R.T. ASTM C373 0.0 Hardness Moh's 8 Hardness knoop (kg/mm2) Knoop 100g 1450 Mechanical Compressive Strength MPa @ R.T. ASTM C773 551 Tensile Strength MPa @ R.T. ACMA Test #4 103.5 Modulus of Elasticity
GPa ASTM C848 150 Flexural Strength (MOR) MPa @ R.T. ASTM F417 170 Poisson's Ratio, u ASTM C818 0.25 Fracture Toughness, KIc MPa x m1/2 Notched Beam Test 2.0 Thermal Max. Use Temperature
(* denotes inert atm.)
C No load cond. 1700 Thermal Shock Resistance DT (C) Quenching 300 Thermal Conductivity W/m-K @ R.T. ASTM C408 3.5 Coefficient of Linear Thermal Expansion, al mm/m-C (~25C through 1000C) ASTM C372 5.3 Specific Heat, cp cal/g- @ R.T. ASTM C351 0.23 Electrical Dielectric Constant 1MHz @ R.T. ASTM D150 6.0 Dielectric Strength kV/mm ASTM D116 9.8 Electrical Resistivity Wcm @ R.T. ASTM D1829 1013
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