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Steatite

Steatite is a low cost material with high electrical resistance at high temperatures, good mechanical strength and a very low dielectric loss factor. Such properties make it ideal for high frequency, low loss, and high voltage insulation. Moreover, steatite is an excellent material for electrical engineering as it can be readily shape sintered into a wide variety of forms such as washers, bushings, resistor forms, spaces and beads. 

Steatite has been used for many years in large-scale industrial systems, household electronic appliances, aerospace and automotive applications, and specialized eletro-technical instruments such as cathode-ray tubes.

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Property Charts & Safety Data Sheets
Property ChartsSteatite
Master Ceramics Property ChartFull Color
Printer Friendly - Color
Printer Friendly - B&W
Safety Data SheetsDense Steatite Ceramic
Unfired Steatite
Prime Features
Low cost materialHigh electrical resistance at high temperatures
Good mechanical strengthVery low dielectric loss factor
Typical Applications
Excellent material for electrical engineeringLarge-scale industrial systems
Household electronic appliancesAerospace and automotive engineering
Specialized eletro-technical instruments (e.g. cathode-ray tubes) 
Materials Property Chart
 Silicates
 PropertyASTM MethodUnitsSteatite L-4Steatite L-5
GeneralCrystal Size (Average)Thin SectionMicrons77
Color----TanGray-Green
Water AbsorptionC 20-97%00
MechanicalDensityC 20-97g/cc2.652.75
HardnessVickers 500gmGPa (kg/mm2)4.9 (500)4.9 (500)
Hardness--R45N5757
Flexural Strength (MOR)
(3 point) @ RT		F417-87MPa (psi x 103117 (17)138 (20)
Tensile Strength @ RT--MPa (psi x 103)103 (15)103 (15)
Compressive Strength @ RT--MPa (psi x 103)551 (80)586 (85)
Elastic ModulusC848GPa (psi x 106)103 (15)103 (15)
Poisson's RatioC848--0.240.24
ThermalC.T.E. 25 - 100° CC 372-96x 10-6/C7.38.5
C.T.E. 25 - 300° CC 372-96x 10-6/C7.48.6
C.T.E. 25 - 600° CC 372-96x 10-6/C7.58.6
Thermal Conductivity @ RTC 408W/m K33
Max Use Temp--Farenheit (°F)23502350
--Celsius (°C)12901290
ElectricalDielectric Strength (.125" Thick)D 149-97AV/mil260270
Dielectric Constant @ 1 MHzD 150-98--5.65.7
Dielectric ConstantD 2520-95--5.65.8
@ GigahertzD 2520-95--9.212.5
Dielectric Loss @ 1 MHzD 150-98--0.0030.0014
Dielectric LossD 2520-95--0.0050.0017
@ GigahertzD 2520-95--9.212.5
Volume Resistivity, 25°CD 257ohms-cm> 1 x 1014> 1 x 1014
Volume Resistivity, 300°CD 1829ohms-cm2 x 10101 x 1011
Volume Resistivity, 500°CD 1829ohms-cm1 x 1094 x 1010
Volume Resistivity, 700°CD 1829ohms-cm2 x 1081 x 109
Note: The information in this data sheet is for design guidance only. STC does not warrant this data as absolute values. Forming methods and specific geometry could affect properties. Slight adjustments can be made to some of the properties to accommodate specific customer requirements. Most of the dense materials in the table are resistant to mechanical erosion and chemical attack. STC has performed ASTM testing qualification for certain compositions, in accordance with ASTM D2442. Please consult our technical staff for appropriate material and specific test results.