Geotextile Permeability Testers

Name: Geotextile Permeability Testers
Brand: Qualitest North America
Availability: InStock
Rating: 4.84 (287 reviews)

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Geosynthetics and Geotextile Testing Equipment

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Geotextile Permeability Testers

Geotextile Permeability Testers | ISO 11058 & ASTM D4491 Cross-Plane Flow Testing

A geotextile permeability tester measures how readily water passes through the thickness of a fabric. That property decides whether a filter drains or blinds. ISO 11058 covers water permeability normal to the plane without load, reporting flow velocity at a 50 mm head. ASTM D4491 describes the same behavior as permittivity, measured in the uncompressed state.

Qualitest supplies ten configurations, from a manual bench unit to automated systems with de-aired, temperature-regulated water. Producers use them for lot release. Hydraulic engineers use them to verify filter compatibility against the soil being retained. One model works by applied pressure instead of head, for barrier membranes.

Why Choose Qualitest for Your Geotextile Permeability Tester

Qualitest North America supplies testing and measurement equipment to laboratories, quality teams, and manufacturers, backed by responsive technical support and calibration service. The Geotextile Permeability Tester range is built for reliable, standards-driven results, so you can source confidently from a single partner. Our team helps you match the right configuration to your samples, applicable standards, and throughput, then supports you through installation and beyond.

Request a Quote

Tell us the fabrics you test, the standard you report against, and how often the test runs, and we will recommend the right geotextile permeability tester. Contact the Qualitest team for pricing and lead times.

Applications

Cross-plane permeability testing supports filtration and drainage design across civil engineering and geosynthetic manufacturing.

Geotextile Manufacturing: verifies that nonwoven and woven filter fabrics deliver the flow capacity declared on the product data sheet, lot after lot.
Landfill and Containment: confirms filter geotextile performance above leachate collection layers and beneath cap drainage systems.
Embankment Dams and Levees: checks that filter fabrics relieve seepage faster than the soil delivers it, so pressure does not build behind the fabric.
Canal and Reservoir Lining: tests fabrics placed beneath linings where trapped seepage lifts or displaces the lining system.
Highway and Railway Drainage: verifies separation and filtration fabrics used in edge drains, blanket drains, and subgrade layers.
Coastal and Erosion Control: measures flow through fabrics installed under riprap, gabions, and revetments where filtration failure causes soil loss.
Barrier Liner Qualification: measures the permeability coefficient of geomembranes and waterproofing sheet under applied pressure.
Acceptance and Third-Party Laboratories: performs shipment acceptance testing on commercial geotextile deliveries before material reaches site.

Geotextile Permeability Tester Range

Ten models run from occasional bench testing to fully automated laboratory systems. Nine drive water through the specimen under a hydraulic head; the tenth applies pump pressure for barrier membranes.

Model	Test Principle	Control and Automation	Description
QualiGTX™ GPT MN	Constant head, 250 mm maximum	Manual valve control, timer to 0.01 s	Benchtop unit with a ø50 mm clamp, 1000 mL graduated cylinder, and integrated 0 to 50 °C thermometer. Accepts specimens up to 20 mm thick. At 36 kg it suits laboratories running permeability as an occasional confirmation test.
QualiGTX™ GPT E	Head driven, ASTM D4491 configuration	Touchscreen, automatic timing	Entry-level cabinet configured for permittivity testing, with dissolved oxygen measurement fitted. The most direct route to a standards-referenced result for routine quality control.
QualiGTX™ GPT GS	Head driven, ISO 11058 configuration	Touchscreen, automatic timing	Shares the QualiGTX™ GPT E chassis, configured for velocity index testing with full dissolved oxygen specification. Choose it where reporting follows the ISO route rather than ASTM.
QualiGTX™ GPT V	Head driven, fixed 20 cm² test area	Touchscreen, automatic timing	Floor-standing analyzer for water resources work, with a machined aluminum alloy clamp that seals the specimen perimeter against edge leakage. Built for dam, levee, and canal filter verification.
QualiGTX™ GPT GW	Head driven, ø80 mm test area	Touchscreen, automatic timing	Floor-standing system with heated and cooled water held at a set point, plus a custom-configured source tank. The largest test area in the range at roughly 50 cm², which tightens repeatability on nonwovens that vary in density across a roll.
QualiGTX™ GPT T	Head driven, thermostatic bath	Touchscreen, temperature and DO control	Holds test water between 10 °C and 60 °C with dissolved oxygen control. Suits laboratories that study how flow capacity shifts with temperature rather than correcting for it after the run.
QualiGTX™ GPT M	Head driven, motorized water level	Touchscreen, powered head adjustment	Steps the head through several settings without a manual reset at each point. Multiple head readings show whether flow has left the laminar regime, which decides whether the reported coefficient is valid.
QualiGTX™ GPT A	Head driven, automated head sequence	Touchscreen, automated positioning and timing	Runs the full sequence with minimal operator input, with compressor cooling on the water circuit. Built for laboratories processing specimens in volume, where setup minutes accumulate across a shift.
QualiGTX™ GPT D	Head driven, de-aired water supply	Touchscreen, de-aeration and DO control	Top of the range, combining de-aired water, dissolved oxygen control, and temperature regulation. Removing dissolved air stops bubbles lodging in the pore structure and drifting readings downward through a run.
QualiGTX™ GPT GM 100	Applied pressure, 0 to 1 MPa	10-inch touchscreen, automatic timing	Pressure driven rather than head driven, measuring the permeability coefficient of barrier membranes across three specimens at once. Built for liner qualification, where the flow being measured sits close to zero.

How to Choose the Right Geotextile Permeability Tester

For occasional confirmation testing on a bench: choose the GPT MN, which keeps the calibration scope small and fits a 500 × 550 mm bench area.
For a standards-referenced result at the lowest entry cost: choose the QualiGTX™ GPT E for ASTM D4491 permittivity, or the GPT GS for ISO 11058 velocity index.
For dam, levee, and canal filter verification: choose the GPT V, configured around the fixed 20 cm² area used in water resources testing.
For the tightest repeatability on non-uniform nonwovens: choose the GPT GW, whose 50 cm² test area samples more fabric structure per specimen.
For work where test temperature must be held rather than corrected: choose the GPT GW or the QualiGTX™ GPT T, which regulates water from 10 °C to 60 °C.
For validating that flow stayed laminar: choose the GPT M, whose motorized head collects several head points in one run.
For high specimen throughput: choose the QualiGTX™ GPT A for automated sequencing, or the GPT D where de-aired water is needed to keep long runs stable.
For geomembranes and waterproofing sheet: choose the QualiGTX™ GPT GM 100, the only pressure-driven model in the range.