Technician performing PI test. The PI is the difference between the liquid limit and the plastic limit (PI = LL-PL). Soils with a high PI tend to be clay, those with a lower PI tend to be silt, and those with a PI of 0 (non-plastic) tend to have little or no silt or clay.

PACS chemical laboratory department is leading the way with our electrochemical/chemical analysis to test soil for sulfate, sulfide, chloride, Ph, resistivity, soundness, along with cement content (titration) of soil-cement mixtures.