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Soil Survey Manual - Table 3-16

Placticity classes

Classes Test description
Non-plastic A roll 4 cm long and 6 mm thick that supports its own weight held on end cannot be formed.
Slightly plastic A roll 4 cm long and 6 mm thick can be formed and, if held on end, will support its own weight. A roll 4 mm thick will not support its own weight.
Moderately plastic A roll 4 cm long and 4 mm thick can be formed and will support its own weight, but a roll 2 mm thick will not support its own weight.
Very plastic A roll 4 cm long and 2 mm thick can be formed and will support its own weight.