Cordierite

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Cordierite

Cordierite Properties
Cordierite is mainly a structural ceramic, often used for kiln furniture due to its extremely good thermal shock.

Cordierite Properties

This is mainly a structural ceramic, often used for kiln furniture due to its extremely good thermal shock resistance.

Like other structural ceramic materials, it also has good thermal and electrical insulating capabilities.

Properties	Units	Test	Value
Physical
Chemical Formula	-	-	2MgO-2Al2O3-5SiO2
Density, r	g/cm3	ASTM C20	2.60
Color	-	-	tan
Crystal Structure	-	-	orthorhombic
Water Absorption	% @R.T.	ASTM C373	0.02 - 3.2
Hardness	Moh's	-	7
Hardness	knoop (kg/mm2)	Knoop 100g	--
Mechanical
Compressive Strength	MPa @ R.T.	ASTM C773	350
Tensile Strength	MPa @ R.T.	ACMA Test #4	25.5
Modulus of Elasticity (Young's Mod.)	GPa	ASTM C848	70
Flexural Strength (MOR)	MPa @ R.T.	ASTM F417	117
Poisson's Ratio, u	-	ASTM C818	0.21
Fracture Toughness, KIc	MPa x m1/2	Notched Beam Test	--
Thermal
Max. Use Temperature (* denotes inert atm.)	ºC	No load cond.	1371
Thermal Shock Resistance	DT (ºC)	Quenching	500
Thermal Conductivity	W/m-K @ R.T.	ASTM C408	3.0
Coefficient of Linear Thermal Expansion, al	mm/m-ºC (~25ºC through ±1000ºC)	ASTM C372	1.7
Specific Heat, cp	cal/g-ºC @ R.T.	ASTM C351	0.35
Electrical
Dielectric Constant	1MHz @ R.T.	ASTM D150	4.7
Dielectric Strength	kV/mm	ASTM D116	5.11
Electrical Resistivity	Wcm @ R.T.	ASTM D1829	1014