Two-Part Vacuum Split Molds for sample sizes ranging from 1.4 to 6in (35.6mm to 152.4mm) are used to prepare granular soil samples for triaxial or permeability testing. The two-part design requires a vacuum source to secure latex membrane in place during soil compaction. Molds for cohesive soils are available as complete assemblies with base and collar or as molds only for increased efficiency in sample preparation.