Material Specification

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

C 408

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)

D 257

At 25°C

>1.0E + 15

>1.0E + 15

-

At 300°C

1.5E + 13

1.9E + 14

-

At 700°C

1.7E + 09

6.6E + 09