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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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