The Plastic Limit, also known as the lower plastic limit, is the water content at which a soil changes from the plastic state to a semisolid state.
The change from a semisolid state to a plastic state is gradual, and so any definition of a boundary limit must be somewhat arbitrary. Therefore a standard empirical definition is used. The plastic limit is the water content at which a soil can be rolled into threads one-eighth inch in diameter without the soil breaking into pieces.
The plastic limit and liquid limit are used together for soil identification and classification.
See also
Thixotropy
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