Hardness 10


Hardness 10 : Resistance to penetration. Commonly recorded in the field using the Hand Test. Fist hard: A gloved fist can penetrate at least 5cm with a 5-10 N force. Four-finger hard: Four gloved fingers can penetrate at least 5cm with a 5-10 N force. One-finger hard: One finger can penetrate at least 5cm with a 5-10 N force. Pencil hard: A hand held pencil can penetrate at least 5cm with a 5-10 N force. Knife hard: A hand held knife can penetrate at least Scm with a 5-10 cm N force.
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