Steatite

Property

ASTM
Method

Designation

L-4

L-5

Color

off-white

gray-green

Gas/Liquid Permeability

F134B

Atm-cc/sec

<1

1.0E^-7

Density

C 20-97

g/cc

2.65

2.74

Hardness

-

Mohs Scale

7

7

Water Absorption

C 20-97

%

0

0

Flexural Strength

F417-87

PSI

17,000

20,000

Tensile Strength

-

PSI

10,000

10,000

Compressive Strength

-

PSI

80,000

85,000

Elastic Modulus

C848

PSI x10⁶

14

15

Shear Modulus

C848

PSI x10⁶

6

6

Linear Coefficient Of Thermal Expansion

C372-96

(@25°C - 100°C)
x10^-6/°C

7.6

9.6

-

(@25°C - 300°C)
x10^-6/°C

7.3

9.5

-

(@25°C - 600°C)
x10^-6/°C

7.5

8.7

Thermal Conductivity 25°C

C408

W/m-K

2

3

Maximum Use Temperature
(Non Loading)

-

°C

1300

1300

-

°F

2350

2350

Dielectric Strength
(1/8" Thick)

D149-97A

V/mil

270

270

Dielectric Constant
@ 1MHz

D150-98

At 25 °C

5.6 (@9.2)

5.9 (@12.7)

Dielectric Constant (@GHz)

D2520-95

At 25 °C

5.6

5.7

Dielectric Loss @ 1MHz

D150-98

At 25 °C

0.003

0.001

Dielectric Loss (@GHz)

D2520-95

At 25 °C

0.005 (@9.2)

0.0017 (@12.7)

Volume Resistivity
(ohm-cm)

D257

@25°C

>1.0E +15

>1.0E +15

-

@300°C

1.5E +13

1.9E +14

-

@700°C

1.7E +09

6.6E +09

NOTE: THE INFORMATION IN THIS DATA SHEET IS FOR DESIGN GUIDANCE ONLY. STC DOES NOT WARRANTY 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 TESTING IN ACCORDANCE WITH ASTM D2442 FOR CERTAIN COMPOSITIONS. PLEASE CONTACT OUR TECHNICAL STAFF FOR APPROPRIATE MATERIAL AND SPECIFIC TEST RESULTS.