{"product_id":"geotextile-water-permeability-tester","title":"Geotextile Water Permeability Tester","description":"\u003ch2\u003e\u003cspan\u003eGeotextile Water Permeability Tester – QualiGTX™ GPT GW\u003c\/span\u003e\u003c\/h2\u003e\n\u003ch4\u003e\u003cspan\u003eTouchscreen Vertical Permeability Apparatus for Geosynthetic Materials\u003c\/span\u003e\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003eThe QualiGTX™ GPT GW geotextile water permeability tester evaluates water flow perpendicular to geosynthetic materials using ø80 mm test specimens. Its large color touchscreen controls the testing sequence, while an automatic digital timer records elapsed time without relying on operator response. The specimen clamping assembly is precision-machined from high-strength aluminum alloy to maintain stable bore dimensions through repeated clamping cycles and provide corrosion resistance during continuous water exposure.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA key advantage of this model is its integrated temperature regulation system. The heating and cooling circuit adjusts the supply water to a specified temperature and maintains that set point throughout testing. This minimizes temperature-related variations instead of requiring laboratories to measure fluctuating water temperatures and apply corrections to the results afterward. A dedicated water source tank is also available as a matching component, supplied according to custom configuration requirements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe ø80 mm specimen diameter provides an effective test area of approximately 50 cm², roughly 2.5 times larger than the area offered by a 50 mm apparatus. This expanded testing area captures flow behavior across a greater portion of the fabric structure, which is particularly beneficial when evaluating needle-punched nonwovens with varying local densities across a production roll. The floor-standing instrument measures 720 × 700 mm in footprint, stands 1900 mm tall, and weighs 120 kg.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eGeotextile Water Permeability Tester – QualiGTX™ GPT GW Applications\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe QualiGTX™ GPT GW is designed for laboratories conducting regular cross-plane permeability testing where measurement consistency and reliable results are essential for evaluating compliance with specification limits.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eGeotextile Manufacturing QC\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Evaluates water flow capacity across production rolls to verify that manufactured materials consistently meet declared permeability values and specified tolerances across production shifts.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eGeocomposite and Composite Fabric Testing\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Measures cross-plane water flow through multilayer drainage and filtration products using a specimen clamp suitable for thicker materials.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFilter Compatibility Studies\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Determines fabric flow capacity to support soil-to-geotextile retention evaluations and clogging assessments.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLandfill and Containment Engineering\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Verifies filtration layer performance in systems installed above leachate collection networks and cap drainage structures.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eDam, Levee, and Canal Works\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Assesses filter fabrics used in hydraulic structures where water flow capacity is critical to long-term seepage control.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHighway and Railway Drainage\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Evaluates separation and filtration geotextiles used in edge drains, subgrade layers, and drainage blanket systems.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAccredited Testing Laboratories\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Supports testing requirements that specify controlled water temperature rather than relying on mathematical corrections after measurement.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eGeosynthetics Research Programs\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Investigates changes in water flow capacity resulting from fiber structure, bonding techniques, and water temperature under repeatable testing conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan\u003eGeotextile Water Permeability Tester – QualiGTX™ GPT GW Key Features\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe QualiGTX™ GPT GW combines an actively regulated water temperature system with touchscreen controls and a large-area specimen clamping assembly to provide consistent cross-plane permeability measurements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eTemperature-Controlled Water Supply\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Heats or cools the supply water to a selected temperature and maintains that setting throughout the test, helping prevent viscosity variations caused by gradual circuit warming.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eø80 mm Specimen Clamp\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Provides an effective test area of approximately 50 cm², capturing flow across a larger portion of the fabric structure and improving repeatability when testing non-uniform nonwoven materials.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHigh-Strength Aluminum Alloy Clamp Body\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Maintains stable bore dimensions during repeated specimen clamping and resists corrosion under continuous water exposure.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLarge Color Touchscreen Control\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Displays test settings, operating status, and measurement results through a centralized interface, supporting consistent operation between technicians.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAutomatic Digital Timing\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Records elapsed time through automatic clock operation, eliminating operator reaction time from start-and-stop measurements and reducing a major source of error during short, high-flow tests.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eMatched Water Source Tank\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Provides a dedicated water supply component configured to work with the instrument, with tank capacity tailored to laboratory testing throughput.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCross-Plane Test Geometry\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Measures water movement through the material thickness, the flow direction relevant to filtration and separation performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFloor-Standing Frame\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e: Integrates the water circuit, temperature regulation system, and specimen testing assembly within a 720 × 700 mm footprint, eliminating the need for a dedicated laboratory bench.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan\u003eTheory and Method\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eCross-plane permeability indicates how easily water passes through the thickness of a geosynthetic material rather than flowing along its surface. The measurement is based on determining the flow rate under a defined hydraulic head across a specified specimen area. Each parameter must remain controlled to produce meaningful and comparable results. The specimen clamp bore determines the test area, with the ø80 mm opening providing approximately 50 cm². This larger area helps represent the overall flow characteristics of the fabric rather than measuring only a localized section beneath a smaller clamp.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSpecimen area plays an important role in the reliability of permeability measurements. Needle-punched nonwoven geotextiles can exhibit considerable variation at small scales because fiber distribution and needle-punch density are not perfectly uniform across a production roll. When a small specimen area is tested, the measurement captures only a limited portion of this variation. Consequently, repeated specimens may produce a wider spread of results, requiring additional tests to establish a reliable average. A larger clamping area captures more of the fabric structure in each measurement, helping reduce result variability and the number of specimens needed to achieve a statistically defensible mean.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWater temperature is another major factor affecting measurement accuracy. As water temperature increases, its viscosity decreases, allowing the same geotextile specimen to pass more water at 30 °C than at 15 °C. Standard testing procedures therefore account for temperature by measuring the water temperature and correcting the result to a specified reference value. However, this correction depends on maintaining stable temperature conditions throughout the test. In systems where water circulates through a pump and reservoir, gradual temperature increases can occur over a morning of testing, introducing variations into the measurements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe integrated active heating and cooling system addresses this issue by maintaining the water supply at a selected temperature, preventing temperature drift at its source. Automatic digital timing provides an additional accuracy benefit by eliminating human reaction time when recording the start and end of a measurement. Together, controlled water temperature and automatic timing reduce two important sources of measurement variation in cross-plane permeability testing.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003eGeotextile Water Permeability Tester – QualiGTX™ GPT GW Technical Specifications\u003c\/h2\u003e\n\u003ctable class=\"table table-style-align-center\" align=\"center\" border=\"1\" cellspacing=\"0\" cellpadding=\"0\" width=\"544\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTest Orientation\u003c\/td\u003e\n\u003ctd\u003eCross-plane (vertical) water flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecimen Size\u003c\/td\u003e\n\u003ctd\u003eø80 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpecimen Clamp Construction\u003c\/td\u003e\n\u003ctd\u003eHigh-strength aluminum alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Supply\u003c\/td\u003e\n\u003ctd\u003eTemperature-controlled, with heating and cooling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Source Tank\u003c\/td\u003e\n\u003ctd\u003eSupplied to custom configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl System\u003c\/td\u003e\n\u003ctd\u003eLarge color touchscreen\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTiming\u003c\/td\u003e\n\u003ctd\u003eAutomatic, digital display\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions (W × D × H)\u003c\/td\u003e\n\u003ctd\u003e720 × 700 × 1900 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet Weight\u003c\/td\u003e\n\u003ctd\u003e120 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Qualitest USA LC","offers":[{"title":"Default Title","offer_id":53459751272759,"sku":null,"price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0786\/1859\/1543\/files\/geotextile-water-permeability-te.webp?v=1793364660","url":"https:\/\/qualitest.us\/es\/products\/geotextile-water-permeability-tester","provider":"Qualitest USA LC","version":"1.0","type":"link"}