Extremely low to low EL,VL, L <0.3 60-150 500 kPa to 2.5MPa Medium M 0.3-1.0 100-350 2 to 12MPa High H 1.0-3.0 250-600 Very to extremely high VH, EH >3 >500 >10MPa

and drive (refer Chapter 4). This is an extrapolated value and not driven value as hammer damage may occur unless a cone tip is used. Note that some procedures recommend refusal in the seating drive only – but this is insufficient data.