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Soil Survey Manual - Table 3-15

Rupture resistance classes applied to crushing plate-shaded specimens

Classes Force (N)
Fragile < 3
     Extremely weak Not removable
     Very weak Removable; < 1
     Weak 1 - 3
Medial 3 - 20
     Moderate 3 - 8
     Moderately strong 8 - 20
Resistive > 20
     Strong 20 - 40
     Very strong 40 - 80
     Extremely strong > 80