Combined Carbon.

Graphitic

Carbon.

Silicon.

Greatest softness.....

0,15

3,1

2,5

"

hardness...

-

-

under 0,8

"

general strength....

0,50

2,8

1,42

"

stiffiness......

-

-

1,0

"

tensile strength....

-

-

1,8

"

crushing strength...

over 1,0

under 2,6

about 0,8