absorbility

%

0 to 0.05

Nil

density

g/cm³

2.48

2.68

hardness

Mohs'

7.5

7.5

liner thermal expansion

/^oC

(40^o to 250^o)

8.6 x 10^-6

9.5 x 10^-6

work temperature

^oC

980

930

flexual strength

MPa

58

62

compressure strength

MPa

550

550

fracture strength (5” distance)

MPa

125

145

thermal conductivity

g.cal x cm.thk

cm² x sec x ^oC

0.006

0.006

dielectric strength (6.35mm thick)

Volts/mil

220

275

dielectric constant 1.0 MHz (wet)

-- --

5.8

6.1

power factor

1.0 MHz(wet)

-- --

0.004

0.0009