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Mullite & Porcelain - Typical Characteristics

Mullite

  • Excellent Thermal Shock Resistance
  • Good Abrasion Resistance
  • Good Wear Resistance
  • High Dielectric Properties

Porcelain

  • Good Resistance to Wear
  • Good Abrasion Resistance
  • Excellent Frost Resistance
  • It is Non Absorbent
  • Good Flexural Strength
Property Details

 

Particulars

Units

Mullite
(55% Al2O3)

Mullite
(75% Al2O3)

Porcelain

Physical

Chemical Composition  

3Al2O3.2SiO2

3Al2O3.2SiO2

Tri-axial
Ceramics

Density

gm / cc

2.8

> 3.80

2.4

Porosity

%

Nil

Nil

Nil

Colour

 

Tan

Tan

Buff

Mechanical

Flexural Strength

Kg / Cm2

1000

1200

1000

Compressive Strength

Kg / Cm2

5650

6000

6000

Hardness (Vickers)

HV10

1150 - 1200

1200

1000

Thermal

Thermal Shock Resistance

Deg C

> 200

> 200

-

Thermal Conductivity

W/m Deg C

2

3

5

Co-efficient of Thermal
Expansion

x 10-6 / Deg C

5.3

6

4.9

Maximum Use Temperature

Deg C

1450 +

1600 +

1400

Electrical

Dielectric Constant

MHz

6

6

5.9

Dielectric Strength

KV / mm

20

25

-

Electrical Resistivity, 25 Deg C

Ω-Cm

1013

1013 - 1014

-

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