Hardness HRC

Impact ductility (no gap)J/cm2

d ( Mpa )

53 ~ 62

5 ~ 8

500 ~ 820

cement

coal

Al mine

Cu mine

Fe mine

Gold mine

< 50

<4 0 ~ 50

<4 50

< 450

< 550

< 750

Broken rate ( % )

<0.5

<0.5

<0.5

<0.5