Steatite Ceramic Crystalline Magnesium Silicate

Physical Properties Of Associated Ceramics Steatite

Steatite Ceramic – 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.

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ACT Material
Code >
  AC-ST300 AC-ST500
Description >  
Steatite
    L3 L5
Color - Cream Cream
Density g/cc 2.5-2.6 2.7-2.8
Porosity % 0-1 0-1
Flexural
Strength
psi (MPa) 18,000 (124) 22,000 (152)
Compressive
Strength
psi (Mpa) 80,000 (552) 90,000 (620)
Tensile
Strength
psi (MPa) 8,400 (60) 10,000 (70)
Elastic
Modulus
psi x 106 (GPa) 15 (103) 16 (110)
Fracture
Toughness
MPa/m 1.5-2.5 1.5-2.5
Dielectric
Strength
Volts/mil 225 230
Dielectric
Loss Tangent
@ 1 MHz 0.026 0.006
Thermal
Conductivity
W/m°K 3.2 3.4
Coefficient
Of Thermal
Expansion
cm/cm/°C
(RT to 700°C)
8.1 8.5
Safe Use
Temperature
°F
°C
2200 1200 2200 1200

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