Cordierite – Magnesium Aluminum Silicate

Cordierite is a magnesium aluminum silicate which possesses an extremely low thermal expansion and low thermal conductivity. Cordierite is used when thermal shock is a concern in the finished product. Available in self-glazing form where higher strength, thermal shock, and dielectric strength is required. Applications include refractory shapes, welding tapes, heaters, thermocouples, and appliance insulators. Shapes shown are not to scale.

Cordierite Properties	Units	ACT 200
Material		Cordierite & Self-Glazing Cordierite
General Application		Appliance Insulators, Refractories, Kiln Furniture & High Thermal Shock Applications
Color (Fired)		Tan
Porosity	%	0-.15
Density	gm/cm3	2.5-2.6
Flexural Strength	psi	15,000-20,000
Comprehensive Strength	psi	30,000-50,000
Tensile Strength	psi	-
Linear Coefficient of Thermal Expansion	(cm/cm/°C) 25-300°C 25-700°C	3.0 X 10-6 3.5 X 10-6
Dielecctric Constant at 25°C	1 MH 10 MH	4.0 5.0
Dielectric Strength	Volt/mil	180
Te Value	°F °C	750 400
Thermal Conductivity at 25°C	cal/sec/cm2/cm/°C	0.004
Thermal Shock		Excellent
Safe Use Temperature	°F °C	2200 1200

Above values are test specimen results and actual shapes may vary in value.
We can work with other formulations as well.