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Manual Geotextile Cone Drop Tester

Manual Geotextile Cone Drop Tester
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Geotextile Cone Drop Testers
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Manual Geotextile Cone Drop Tester - QualiGTX™ CDT M

Manual Geotextile Cone Drop Tester determines how far a falling steel cone penetrates geotextiles and related geosynthetic products. Laboratories report the result as the diameter of the perforation the cone opens, a figure that ranks one fabric against another on damage resistance. The QualiGTX™ CDT M delivers that measurement from a compact, hand-operated frame.

Operation stays entirely mechanical. The technician clamps the specimen in the ring, raises the cone to the latch position, and releases it onto the fabric center. Nothing about the sequence depends on software, sensors, or a power supply, so the apparatus starts working the moment it is unpacked and leveled. Laboratories running moderate sample volumes get the full drop cone geometry at a lower acquisition cost than an automated station.

The QualiGTX™ CDT M carries the standard test hardware: a 45° stainless steel cone with a total mass of 1000 g, a 150 mm clear clamping ring, and a graduated measuring cone for reading the hole. The frame occupies a footprint of 600 by 300 mm and weighs 45 kg, which suits crowded materials labs, university teaching labs, and site laboratories where floor space is limited. Qualitest also supplies an automated version of this test for high-throughput production QC.

Manual Geotextile Cone Drop Tester - QualiGTX™ CDT M Applications

The QualiGTX™ CDT M serves laboratories that qualify geosynthetics for burial under coarse fill, where a single sharp stone can compromise the fabric before the structure is ever loaded.

  • Geosynthetic Manufacturing Quality Control: verifies perforation resistance batch by batch on woven, nonwoven, and needle-punched product lines
  • Protection Geotextile Selection: compares cushion fabrics specified above and below geomembrane liners by how large a hole a point impact leaves
  • Road and Highway Construction: qualifies separation and stabilization geotextiles placed on soft subgrade before the first aggregate lift arrives
  • Landfill and Waste Containment: supports material approval for capping and basal lining systems where liner protection governs long-term performance
  • Site and Project Laboratories: provides an incoming-material check on delivered geotextile rolls without shipping samples to an external lab
  • University and Research Laboratories: demonstrates dynamic perforation behavior and supports geosynthetics research programs on a modest equipment budget
  • Railway and Ballast Applications: evaluates fabrics installed beneath angular track ballast that bears directly on the geotextile surface
  • Erosion Control and Riprap Works: assesses filter fabrics laid under armor stone along coastlines, riverbanks, and channel linings
  • Drainage and Filtration Systems: confirms that geotextile wraps around aggregate drains survive backfilling operations
Manual Geotextile Cone Drop Tester

Manual Geotextile Cone Drop Tester - QualiGTX™ CDT M Key Features

The QualiGTX™ CDT M reduces the drop cone method to its mechanical fundamentals, with the tolerances that govern result accuracy built into fixed hardware.

  • Manual Cone Lift and Release: gives the operator direct control over each drop with a simple latch mechanism, keeping the apparatus serviceable in labs without electrical or pneumatic support
  • Precision 45° Stainless Steel Cone: holds the specified tip angle, 50 mm maximum diameter, and 1000 ± 5 g total mass with the guide rod counted in, so drop energy stays correct
  • Graduated Measuring Cone Supplied: includes the 600 g small-angle cone required to read perforation diameter, so the laboratory can report results without sourcing a separate gauge
  • Fixed 500 mm Drop Height: sets the tip-to-specimen distance within ±2 mm at the latch position, removing the height-setting error common to improvised drop rigs
  • 150 mm Clamping Ring: holds every specimen to the same clear diameter, keeping the unsupported span identical from test to test
  • Guided Vertical Column: constrains the cone through its full travel and lands the tip on the specimen center, preventing angled strikes that would distort the hole
  • Compact 600 by 300 mm Footprint: fits along a wall or against a bench end in laboratories where floor area is already committed
  • 45 kg Frame Weight: stays stable through repeated drops while remaining light enough for two technicians to reposition
  • Corrosion-Resistant Cone Construction: stainless steel holds tip geometry and surface finish across long service intervals, protecting result consistency

Theory and Method

Every drop on this apparatus delivers the same impact energy, and that repeatability is what makes the result comparable across materials. A 1000 g cone falling 500 mm reaches the specimen with roughly 4.9 joules. The 45° tip funnels that energy into a contact patch only a few square millimeters wide, which raises local stress well beyond the level a spread load would generate. Filaments elongate, slip past one another at their bond points, and eventually rupture as the cone forces its way through.

Reading the result relies on the hole rather than on any transducer. The technician withdraws the drop cone and inserts the graduated measuring cone into the perforation until it seats against the fabric, then reads the diameter directly off the scale. Dense woven and heavy needle-punched fabrics close back around the opening and produce small readings. Lightweight nonwovens tear wide and produce large ones.

Boundary conditions shape the outcome as much as the fabric does. The clamping ring grips only the specimen edge and leaves a 150 mm unsupported span, letting the material deflect downward under impact the way it would over a compressible subgrade. That arrangement reproduces the field event the test was designed around: angular aggregate dropping onto geotextile during placement. Dynamic perforation is an index property and complements static puncture and tensile data rather than substituting for it.

Manual Geotextile Cone Drop Tester - QualiGTX™ CDT M Technical Specifications

ParameterSpecification
Clamping Ring Inner Diameter150 ± 0.5 mm
Drop Height (Cone Tip to Specimen)500 ± 2 mm
Drop Cone MaterialStainless steel
Drop Cone Maximum Diameter50 mm
Drop Cone Angle45°
Drop Cone Total Mass (Including Guide Rod)1000 ± 5 g
Graduated Measuring Cone Mass600 ± 5 g
Cone Lifting and ReleaseManual
Specimen ClampingManual clamping ring
Overall Dimensions (W × D × H)600 × 300 × 1500 mm
Net Weight45 kg

Included Components

ItemQuantityDescription
Stainless Steel Drop Cone Assembly145° cone angle, 50 mm maximum diameter, 1000 ± 5 g total mass including guide rod
Graduated Measuring Cone1600 ± 5 g small-angle cone for reading perforation diameter
Specimen Clamping Ring Assembly1 set150 ± 0.5 mm clear inner diameter

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Geotextile Cone Drop Testers