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Cordierite & Steatite - Typical Characteristics

Cordierite

  • Low Thermal Co-efficient of Expansion
  • Low Thermal Conductivity
  • Very Low Electrical Conductivity
  • High Resistance to Thermal Shock
  • Volume Resistivity
  • Low Dielectric Loss Factor
  • Moderate Strength
  • Low Density

Steatite

  • High Resistivity
  • Good to Excellent Electrical properties
  • Very Low Electric Loss Factor
  • Moderate Strength
  • Low Density
Property Details

 

Particulars

Units

Cordierite
(Dense)

Cordierite
(Porous)

Steatite

Physical Chemical Composition  

2MgO.2Al2O3.5SiO2

2MgO.2Al2O3.5SiO2

MgO.SiO2

Density

gm / cc

2.40

2.10 - 2.20

2.70

Porosity

%

0.1 - 0.5

15 -20 %

Nil

Colour

 

Tan

Grey / Brown

Buff

Mechanical

Flexural Strength

Kg / Cm2

1050

1000

1300

Compressive Strength

Kg / Cm2

2100

1950

6000

Hardness (Vickers)

HV10

1000

750

520

Thermal

Thermal Shock Resistance

Deg C

300

350

190

Thermal Conductivity

W/m Deg C

3

1.5 - 2

2.9

Co-efficient of Thermal
Expansion

x 10-6 / Deg C

3 - 3.5

3 - 4.5

8.5

Maximum Use Temperature

Deg C

1000

1000

1050

Electrical

Dielectric Constant

MHz

4.8

4

6

Dielectric Strength

KV / mm

5.12

5

6

Electrical Resistivity, 25 Deg C

Ω-Cm

1014

1014

1013

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