Geotextile Thickness Gauge
Geotextile Thickness Gauges
A geotextile thickness gauge measures the nominal thickness of geosynthetic materials under a specified pressure. Because compressible fabrics change thickness under load, every measurement must be reported alongside the applied pressure. ASTM D5199 specifies the method for determining the nominal thickness of geosynthetics, while ISO 9863 addresses thickness measurements at specified pressures, including a second part covering individual layers within multilayer products.
Qualitest offers six gauge configurations, ranging from manually operated lever instruments that require no electrical power to servo-driven platforms supporting seven test modes. Manufacturers use these instruments to verify production lots against published product data sheets, while laboratories rely on thickness measurements for permeability calculations and conformity assessments.
Applications
Geotextile thickness testing supports quality control throughout geosynthetic manufacturing and construction acceptance.
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Geotextile Manufacturing: Checks woven and nonwoven geotextile rolls against the nominal thickness specified in product data sheets.
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Geomembrane and Liner Production: Verifies that polymeric and bituminous barrier sheets maintain their specified thickness throughout extrusion and calendering processes.
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Drainage Geocomposite QC: Records the deformation of compressible cores as applied pressure increases from 2 kPa to 200 kPa.
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Landfill and Containment Works: Confirms that liner, cushioning, and cover materials meet project specifications before installation.
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Contractor Incoming Inspection: Checks delivered materials at storage yards or site laboratories before they are incorporated into construction projects.
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Permeability Reporting: Provides nominal thickness measurements used to convert permittivity results into a coefficient of permeability.
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Conformity and Type Testing: Generates individual-layer and overall thickness measurements required for certification documentation.
Geotextile Thickness Gauge Range
Qualitest offers six models, covering applications from basic mechanical bench testing to automated platforms designed for multiple testing standards. Five models measure total material thickness, while the sixth is designed to measure individual layers within bonded composite products.
| Model | Test Scope | Pressure Stages | Resolution | Description |
|---|---|---|---|---|
| QualiGTX™ TG 40 | Geotextiles and geomembranes | 2, 20, 200 kPa | 0.01 mm | Lever gauge with a single 25 cm² presser foot, reading 0 to 12 mm. Needs no power connection and no load cell calibration, which keeps the calibration scope short. At 40 kg it suits laboratories running thickness as a routine confirmation check. |
| QualiGTX™ TG L | Geotextiles and geomembranes | 2, 20, 200 kPa | 0.01 mm | Lever gauge supplied with four matched 25 cm² presser feet, so several specimens sit under load together at the 2 kPa stage instead of running one at a time. A low-profile 400 mm frame puts the dial at reading height. |
| QualiGTX™ TG GM | Uniform polymeric and bituminous barriers | Fixed 20 kPa | 0.01 mm | Single-purpose digital gauge for smooth barrier and waterproofing sheet, reading 0 to 10 mm. Fixed pressure means no weights to select, so results stay consistent between operators and the test cycle stays short. |
| QualiGTX™ TG D | Geotextiles, geomembranes, geonets, geocomposites | 2 kPa ± 0.01 kPa | 0.001 mm | Stepper-driven closed-loop frame with Class 1 accuracy, reading 0 to 12 mm. A 10-inch LCD plots thickness against load as the test runs, so compression behavior is visible rather than reduced to one end value. |
| QualiGTX™ TG A | All geosynthetics, seven test modes | 2, 20, 200 kPa | 0.001 mm | Dual servo platform carrying 100 cm² and 25 cm² presser feet plus coaxial presser points for uneven thickness. Seven methods run without changing hardware, and results upload over the network. The broadest method coverage in the range. |
| QualiGTX™ TG ML | Single layers inside bonded multilayer products | At the pressure the method specifies | 0.1 mm | Stacking apparatus holding five specimens between four 1.0 mm separator plates, with platens that deflect no more than 0.1 mm under load. Reports layer thickness in geocomposites whose layers cannot be separated without damaging them. |
How to Choose the Right Geotextile Thickness Gauge
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For routine verification without an electrical power supply: Select the TG 40, a straightforward three-stage lever-operated gauge.
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For increased specimen throughput without automation: Choose the TG L, featuring four matched presser feet that allow dwell periods to overlap.
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For smooth liners and waterproofing sheets: Select the TG GM, a fixed-pressure gauge that eliminates the need for operators to select measurement weights.
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For thin membranes and coatings requiring greater measurement precision: Choose the TG D or TG A. Both provide a resolution of 0.001 mm, compared with 0.01 mm on the other models.
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For analyzing material compression under increasing loads: Choose the TG D, which displays a live thickness-versus-load curve.
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For laboratories performing tests under multiple methods: Select the TG A, which supports seven test modes on a single frame without requiring presser-foot changes.
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For measuring individual layers in bonded geocomposites: Choose the TG ML, the only model in the range designed to measure thickness within multilayer products.
Why Choose Qualitest for Your Geotextile Thickness Gauge
Qualitest North America supplies testing and measurement equipment to manufacturers, laboratories, and quality control teams, supported by responsive technical assistance and calibration services. The Geotextile Thickness Gauge range is designed to deliver reliable measurements aligned with applicable testing standards, allowing customers to source their equipment from one trusted supplier.
Our team helps you identify the appropriate gauge configuration based on your sample materials, required testing standards, and specimen throughput. We also provide support from installation onward to help meet your testing and measurement requirements.
Request a Quote
Share details about the materials you test, the pressure levels specified in your testing procedures, and your typical specimen volume. Our team will recommend a suitable geotextile thickness gauge for your application.
Contact the Qualitest team for pricing and lead-time information.
