PROPERTY

TEST UNIT

Porcelain

STEATITE

C5
CORDIERITE

REFRACTORY

REFRACTORY

PURE MgO

COLOUR

WHITE

CREAM

GREY

WHITE / CREAM

DARK CREAM

LIGHT BROWN

DENSITY

Grams/cm³

2.4

2.6

2.3

2.0

2.2

3.3

POROSITY

%

NIL

NIL

NIL

POROUS

POROUS

N.A

CROSS BENDING

STRESS

MN/m²

1cm diam.sample

82.74

124.11

75.84

48.26

44.82

N.A

COMPRESSIVE STRENGTH

MN/m²

1cm diam.sample

482.63

750.42

698.48

275.79

262.0

N.A

TENSILE STRENGTH

MN/m²

48.26

55.16

-

-

-

N.A

PERMITIVITY

5-4

6

5-7

-

-

-

POWER

1KHz :

80-100

35

-

-

-

-

FACTOR

1MHz : x 10^-4

"

30

70

-

-

-

10MHz:

"

32

-

-

-

-

20°^C

>10¹⁴

>10¹⁴

>10¹⁴

dry >10¹²

dry >10¹⁴

dry >10¹⁴

300°^C

6 x 10⁶

3 x 10⁷

5 x 10⁸

5 x 10⁸

10⁹

10¹³

RESITIVITY

Ω/CM³ @ :

600°^C

3 x 10⁴

10⁵

7 x 10⁵

10⁶

10⁷

10¹⁰

900°^C

2 x 10³

7 x 10³

2 x 10⁵

10³

10⁵

10⁸

DIELECTRIC STRENGTH

KVmm

@ 20 °^C sample

thickness 5mm

25

24

-

-

25

-

THERMAL CONDUCTIVITY

W/m/K

@375-1200

2.06

@375-1000

1.91

@300-400

3.26

HARDNESS

MOHS

7-8

7-8

7

6

6

-

COEFFICIENT of LINEAR EXPN.

X 10^-6 @

20-800°^C

6.5

7.5

2.6

4.0

4.5

-