{"product_id":"manual-geotextile-apparent-opening-size-aos-tester","title":"Manual Geotextile Apparent Opening Size (AOS) Tester","description":"\u003ch2\u003eManual Geotextile Apparent Opening Size (AOS) Tester – QualiGTX™ AOS M\u003c\/h2\u003e\n\u003cp\u003eThe QualiGTX™ AOS M determines the apparent opening size of single-layer geotextiles and related geosynthetic\n    materials through dry sieving with graded glass beads. Its manually operated controls regulate a motor-driven sieve\n    shaker, allowing laboratories to obtain O95 measurements without the setup and maintenance associated with\n    programmable interfaces. Designed for woven, nonwoven, and composite geotextiles, the instrument supports material\n    evaluation across commercially available fabric constructions. Manufacturers, contractors, quality-control\n    departments, and independent testing laboratories rely on these measurements to assess whether a geotextile's pore\n    structure is appropriate for the soil it must retain.\u003c\/p\u003e\n\u003cp\u003eThe instrument accommodates five specimens during a single testing cycle. Individual pressing rings secure each\n    fabric within the sieve column, while five stainless steel sieve pans collect the glass beads passing through the\n    respective specimens. A graded glass bead set is included, providing the reference material required for testing.\n    The 200 mm sieve column supports a total stack height of 400 mm, providing sufficient capacity for all five specimen\n    frames and collection pans in one operation. This multi-specimen arrangement allows laboratories to evaluate five\n    fabrics simultaneously rather than conducting separate tests for each sample.\u003c\/p\u003e\n\u003cp\u003eThe shaker operates with specified agitation rates and defined tolerances to maintain consistent testing conditions.\n    Its sieve base produces 220 oscillations per minute (±10) and 150 vertical impacts per minute (±10), with a 10 mm\n    amplitude and 12 mm radius of gyration. These operating limits provide measurable reference points for checking\n    equipment performance during commissioning and routine verification against the applicable test method. With an\n    overall weight of 80 kg, the instrument offers a practical configuration for standard laboratory workspaces.\u003c\/p\u003e\n\u003ch2\u003eManual Geotextile Apparent Opening Size (AOS) Tester – QualiGTX™ AOS M Applications\u003c\/h2\u003e\n\u003cp\u003eThe apparent opening size of a geotextile determines how effectively it can retain soil particles while allowing\n    water to pass through. Measuring this property helps engineers and material specialists select appropriate fabrics\n    for separation, filtration, drainage, and erosion-control applications.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eIncoming Geotextile Quality Inspection: Evaluates incoming fabric batches against the manufacturer's declared\n            O95 value, helping quality-control personnel identify materials that do not meet specified requirements\n            before installation.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eRoad and Railway Subgrade Stabilization: Assesses separation geotextiles used between subgrade soils and\n            aggregate base layers, ensuring the fabric can restrict the upward migration of fine particles under\n            repeated traffic loads.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eSubsurface Drainage Systems: Provides the opening size data needed to select compatible filter fabrics for\n            trench drainage, roadway edge drains, and collector pipe installations.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eDams, Canals, and Hydraulic Structures: Evaluates filtration materials placed behind riprap, beneath\n            revetments, and around toe drains to support soil retention in dams, levees, and canal protection systems.\n        \u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eCoastal Protection and Slope Erosion Control: Determines the suitability of geotextiles used in scour\n            protection aprons, gabion linings, and silt fences before deployment in exposed environments.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eLandfill and Waste Containment Applications: Verifies the pore characteristics of filtration and protective\n            geotextile layers incorporated into leachate collection arrangements and landfill cover systems.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eThird-Party Material Testing: Performs routine apparent opening size assessments for independent laboratories\n            supporting engineering specifications, regulatory agencies, and product certification programs.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eGeotextile Product Development: Helps manufacturers examine how fiber diameter, needling density, and\n            calendering conditions influence the resulting pore structure, supporting product comparisons and material\n            development.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eManual Geotextile Apparent Opening Size (AOS) Tester – QualiGTX™ AOS M Key Features\u003c\/h2\u003e\n\u003cp\u003eThe QualiGTX™ AOS M combines direct manual controls, five-specimen testing capacity, and controlled mechanical\n    agitation in a configuration designed for dry sieving applications.\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eDirect Manual Controls: Provides straightforward operation through dedicated controls rather than\n            software-driven menus, simplifying operator training and eliminating software maintenance requirements.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eMotorized Sieve Shaker: Uses a 0.37 kW motor to generate consistent oscillating and tapping movements\n            throughout the test cycle, providing controlled mechanical agitation instead of manual shaking.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eFive-Specimen Testing Capacity: Allows five geotextile samples to undergo testing in the same cycle, reducing\n            the time required for batch inspection and routine laboratory work.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eFive Stainless Steel Collection Pans: Separates the beads passing through each specimen for individual\n            weighing while providing corrosion resistance during cleaning and routine handling.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eFive Specimen Pressing Rings: Secures each fabric flat within its respective frame without introducing\n            tension, helping maintain consistent conditions across all five specimens.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eComplete Graded Glass Bead Set: Includes the reference beads required for apparent opening size measurements,\n            allowing laboratories to begin testing without sourcing a separate bead set.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003e200 mm Sieve Column and 400 mm Stack Height: Provides room for the complete arrangement of specimen frames\n            and collection pans, allowing all five samples to be processed in one cycle.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eDefined Agitation Tolerances: Maintains an oscillation rate of 220 cycles per minute (±10) and a tapping rate\n            of 150 impacts per minute (±10), supporting consistent test conditions between operators and laboratories.\n        \u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003eControlled Motion Geometry: Combines a 10 mm amplitude with a 12 mm radius of gyration to establish the\n            prescribed movement pattern and distribute glass beads across the specimen surface.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n    \u003cli\u003e\n\n\n        \u003cp\u003e80 kg Compact Construction: Offers a manageable equipment footprint for conventional laboratory layouts and\n            makes repositioning between workbenches easier than with heavier sieve-shaking equipment.\u003c\/p\u003e\n\n\n    \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTheory and Test Method\u003c\/h2\u003e\n\u003cp\u003eThe dry sieving method determines the apparent opening size of a geotextile by evaluating how glass beads of known\n    sizes pass through its structure. Rather than measuring individual pores directly, the procedure establishes a\n    relationship between bead diameter and the proportion passing through the fabric.\u003c\/p\u003e\n\u003cp\u003eTesting begins by securing a geotextile specimen in a sieve frame and placing a weighed quantity of glass beads from\n    a narrowly graded size fraction on its surface. The shaker then agitates the assembly for the specified testing\n    period. Beads smaller than the openings they encounter can pass through the fabric and collect in the sieve pan\n    below. The collected material is subsequently weighed to establish the percentage of the original bead charge that\n    passed through the specimen.\u003c\/p\u003e\n\u003cp\u003eThe procedure is repeated using progressively larger bead fractions to generate a series of passing percentages.\n    These measurements are plotted against the corresponding bead diameters to establish a particle-size distribution\n    curve. The apparent opening size, designated O95, is determined at the diameter corresponding to 5% passing or less.\n    This value represents an approximate upper particle-size threshold for material passing through the geotextile.\u003c\/p\u003e\n\u003cp\u003eO95 is an important consideration when selecting filtration fabrics. An opening size that is too large can allow soil\n    fines to migrate through the geotextile, potentially compromising the stability of the surrounding structure.\n    Conversely, openings that are too small can become blocked by retained particles, restricting water movement and\n    reducing drainage performance.\u003c\/p\u003e\n\u003cp\u003eThe mechanical action of the sieve shaker plays a critical role in obtaining reliable measurements. Horizontal\n    circular oscillation moves the glass bead layer across the specimen, exposing the beads to a representative\n    distribution of fabric openings rather than concentrating contact in one area. Vertical tapping provides additional\n    impact energy, helping dislodge beads that become temporarily lodged within the fiber network.\u003c\/p\u003e\n\u003cp\u003eBoth movements must remain within their specified operating ranges because variations in oscillation and tapping\n    rates alter the energy transferred to the bead layer. These changes can affect bead passage and shift the resulting\n    apparent opening size. The QualiGTX™ AOS M maintains controlled agitation through its defined operating tolerances,\n    supporting repeatable testing conditions and comparable O95 measurements.\u003c\/p\u003e\n\n\u003ch2\u003eManual Geotextile Apparent Opening Size (AOS) Tester - QualiGTX™ AOS M Technical Specifications\u003c\/h2\u003e\n\u003ctable class=\"table\" style=\"width: 100%;\" border=\"1\" cellspacing=\"0\" cellpadding=\"0\"\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 Principle\u003c\/td\u003e\n            \u003ctd\u003eDry sieving, single-layer geotextile and related products\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eMeasured Property\u003c\/td\u003e\n            \u003ctd\u003eApparent opening size (AOS \/ O95)\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSieve Diameter\u003c\/td\u003e\n            \u003ctd\u003e200 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSieve Stack Height\u003c\/td\u003e\n            \u003ctd\u003e400 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSieve Base Amplitude\u003c\/td\u003e\n            \u003ctd\u003e10 mm ± 2 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSieve Oscillation Rate\u003c\/td\u003e\n            \u003ctd\u003e220 oscillations\/min ± 10\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eTapping Rate\u003c\/td\u003e\n            \u003ctd\u003e150 taps\/min ± 10\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eRadius of Gyration\u003c\/td\u003e\n            \u003ctd\u003e12 mm ± 1 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSpecimen Capacity\u003c\/td\u003e\n            \u003ctd\u003e5 specimens per cycle\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eControl Type\u003c\/td\u003e\n            \u003ctd\u003eManual\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eMotor Power\u003c\/td\u003e\n            \u003ctd\u003e0.37 kW\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eVotlage\u003c\/td\u003e\n            \u003ctd\u003e380 V\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eDimensions (W × D × H)\u003c\/td\u003e\n            \u003ctd\u003e770 × 650 × 1060 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eWeight\u003c\/td\u003e\n            \u003ctd\u003e80 kg\u003c\/td\u003e\n        \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eIncluded Configuration\u003c\/h3\u003e\n\u003ctable class=\"table\" style=\"width: 100%;\" border=\"1\" cellspacing=\"0\" cellpadding=\"0\"\u003e\n    \u003cthead\u003e\n        \u003ctr\u003e\n            \u003cth\u003eItem\u003c\/th\u003e\n            \u003cth\u003eQuantity\u003c\/th\u003e\n            \u003cth\u003eDescription\u003c\/th\u003e\n        \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eStandard Glass Bead Set\u003c\/td\u003e\n            \u003ctd\u003e1 set\u003c\/td\u003e\n            \u003ctd\u003eGraded reference beads for dry sieving determinations\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSpecimen Pressing Rings\u003c\/td\u003e\n            \u003ctd\u003e5\u003c\/td\u003e\n            \u003ctd\u003eClamps geotextile specimens flat within the sieve frames\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eStainless Steel Sieve Pans\u003c\/td\u003e\n            \u003ctd\u003e5\u003c\/td\u003e\n            \u003ctd\u003eCollects beads passing through each specimen for individual weighing\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n            \u003ctd\u003eSieve Column Assembly\u003c\/td\u003e\n            \u003ctd\u003e1\u003c\/td\u003e\n            \u003ctd\u003e200 mm frames with 400 mm stacking capacity\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":53604211228983,"sku":null,"price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0786\/1859\/1543\/files\/manual-geotextile-apparent-openi.webp?v=1794479796","url":"https:\/\/qualitest.us\/fr\/products\/manual-geotextile-apparent-opening-size-aos-tester","provider":"Qualitest USA LC","version":"1.0","type":"link"}