Steatite – Crystalline Magnesium Silicate

Steatite is a crystalline form of magnesium silicate. It is a low loss, low cost, relatively good strength insulating material which can function safely at temperatures up to 2,000° F. Applications include high frequency insulation, resistor cores and casings, and appliance insulators. Shapes shown are not to scale.

Steatite Properties	Units	ACT 300	ACT 500
Material		L-3 Grade Dense Steatite	L-5 Grade Dense Steatite
General Application		High Frequency & Appliance Insulators, Resistor Cores & Casings	Lower Electrical Loss, Higher Strength & Higher Cost than L-3 Steatite
Color (Fired)		White	Cream
Porosity	%	0-.05	0-.05
Density	gm/cm3	2.6	2.7
Flexural Strength	psi	20,000	20,000
Comprehensive Strength	psi	75,000	80,000
Tensile Strength	psi	8,400	10,000
Linear Coefficient of Thermal Expansion	(cm/cm/°C) 25-300°C 25-700°C	8.1 X 10-6 8.5 X 10-6	7.2 X 10-6 8.1 X 10-6
Dielecctric Constant at 25°C	1 MH 10 MH	5.8 5.7	6.2 6.5
Dielectric Strength	Volt/mil	225	230
Te Value	°F °C	806 430	1382 750
Thermal Conductivity at 25°C	cal/sec/cm2/cm/°C	0.006	0.006
Thermal Shock		Fair	Fair
Safe Use Temperature	°F °C	2200 1200	2300 1260

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