Porcelain | High Alumina | Steatite | Cordierite | Mullite | Macor | Zirconia | Ceramic Coating | Silicon Carbide | Titanium Dioxide | ZTA (Zirconia Toughened Alumina)

Mullite is an excellent material due to its high temperature stability, strength and creep resistance. It is similar to Cordierite, although it is not as good an insulator and has a higher coefficient of thermal expansion. It is commonly used in heater exchange parts and electrical insulators.
General
Property ASTM Method Units Mullite
Color Gray – Tan
Water Absorption C 20-97 % 0
Mechanical
Property ASTM Method Units Mullite
Density C 20-97 g/cc 3.00
Hardness Vickers 500 gm GPa (kg/mm 10 (1000)
Flexural Strength (MOR) (3 point) @ RTº F417-87 MPa (psi x 103) 206 (30)
Compressive Strength @ RTº MPa (psi x 103) 1034 (150)
Thermal
Property ASTM Method Units Mullite
C.T.E., 25 – 100°C C 372-96 x10-6/°C 3.6
C.T.E., 25 – 600°C C 372-96 x10-6/°C 4.8
Thermal Conductivity @ RTº C 408 W/m-K 4
Max Use Temperature (Non-Loading)

(at high strength)

Celsius (°C) 1700
GROUP
FEATURE OF COMPOSITION Zr02  – 95% ZrSi04  – 50%
APPLICATION RANGE High mechanical strength, exceptional wear resistance, good resistance to thermal shock. Good refractoriness and good thermal shock, resistance, suited for L.V. circuit breaker.
PROPERTIES
COLOUR Creamish Tan
POROSITY (Vol. %) 0 30
BULK DENSITY (g/cm2) 5.40 2.58
HARDNESS (Mohs Scale) 8
  FLEXURAL

STRENGTH

(N/mm2)

  Unglazed 220 35
  Glazed
THERMAL

EXPANSION

LINER

COEFFICENT

(10-6 K-1)

a20 – 1000c 8.70 3.40
a20 – 3000c 9.50 3.10
a20 – 6000c 10.50 3.70
a20 – 8000c 11.00 4.00
THERMAL SHOCK RESISTANCEMIN. (K) 80 350
THERMAL CONDUCTIVITY (20-100C)
   VOLUME

RESISTIVITY

IN TERMS OF

TEMPERATUR

E (D.C.)cm

200C 1014
2000C
6000C