What is the diameter of the dish used for the plastic limit procedure?

The diameter of the dish used for the plastic limit procedure is specifically designed to standardize the testing method for determining the plastic limit of soils. In this procedure, the 115 mm dish allows for sufficient space to manipulate and form the soil sample into threads that are then tested to see at what moisture content the sample breaks. The standardization of this diameter helps ensure consistency across tests, which is crucial for obtaining comparable results in geotechnical assessments. Using the specified diameter is important as deviations could affect the outcome of the test, impacting the classification and assessments of the soil’s plasticity.