GP/PP liners

Direct push liners are thin-walled, clear plastic tubes (typically PVC or PETG) inserted into a steel sampler to capture and preserve a continuous soil core as it is driven into the ground. They act as a removable “inner sleeve,” allowing geologists to extract the soil sample intact for logging and laboratory analysis without the soil ever touching the metal sampler walls.
Key Features and Specifications
Material: Most are made of high-quality clear PVC for easy visual inspection, though Teflon (FEP) liners are available for high-sensitivity contaminant projects.
Sizes: Designed to fit specific sampling systems.
Macro-Core® MC5: 2.25-inch OD sampler uses a ~1.75 to 2.0-inch diameter liner, typically 60 inches (5 feet) long.
Dual Tube (DT22/DT32): Smaller diameters (e.g., 1.125″ to 1.5″) used in nested casing systems.
Core Integrity: The smooth interior surface minimizes friction, ensuring the soil column doesn’t compress or “barrel” during the drive.
Disposable: These are single-use items, preventing cross-contamination between different depth intervals or boreholes.
Types of Liners
Standard Clear PVC: The industry workhorse; cost-effective and provides a crystal-clear view of soil stratigraphy.
PETG (Polyester): Often used when a tougher, more impact-resistant material is needed for dense or gravelly soils.
Pre-cut/Slotted: Some liners come with factory-cut slits to make opening them with a liner cutter safer and faster in the field.