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Apparent Opening Size Test instrument FOR GEOTEXTIL

Apparent Opening Size Test instrument FOR GEOTEXTIL

Model: UT4062D; ASTM D4751, BS 6906-2

AOS (Apparent Opening Size) is a property that is commonly tested on a variety of geotextile fabrics. 

Apparent Opening Size Test instrument are used for determining the effective apparent opening size of geotextiles and composite geotextiles by the dry sieving method. conform ASTM D4751, BS 6906-2. 

General Introduction

AOS (Apparent Opening Size) is a property that is commonly tested on a variety of geotextile fabrics. 

Apparent Opening Size Test instrument are used for determining the effective apparent opening size of geotextiles and composite geotextiles by the dry sieving method. conform ASTM D4751, BS 6906-2. IS 14294, KS K 0754

Main features

  • Test principle
  • Technical Advantages
  • Standard

Using geotextiles and other geosynthetic material samples as sieves, a certain mass and diameter of standard granular material is placed on the sample for vibration sieving. The mass of standard granular material that passes through the sample is weighed, and the passing rate is calculated. 


Different diameters of standard granular material are used for testing, and a curve of standard granular material diameter versus passing rate is plotted, which represents the pore size distribution curve of the sample, from which the effective pore size is determined. 


1. The machine adopts an integrated design, saving space without the need for supporting auxiliary equipment.

2. Equipped with 5 sets (10 pieces) of test sieves, allowing 5 samples to be tested in 10 minutes, greatly improving efficiency.

3. Touch screen operation display with a Chinese menu for easy operation.

4. Customized sieve trays and combined sieve mesh prevent leakage of edge particles, effectively holding the samples and improving testing accuracy.

5. Utilizes a high-temperature spraying process, making it rust-resistant and corrosion-resistant.


ASTM D4751

BS 6906-2

IS 14294, KS K 0754


JTG E50-2006, SL235-2012, GB/T 14799-2005, JT/T 1432.2-2022, Q/CR 549.5-2016, etc. 

Main Technical Specification

Display4.3-inch true color touch display screen with Chinese menu operation
Specifications of combined sieve meshФ200mm 5 pieces
Specifications of sieve trayФ200*45 mm 5 pieces
Testing quantity5 sets/sample, can test 5 sets of samples simultaneously, Can test 5 sets of sieves at the same time, automatically stopping shaking after the set time
Sieve stacking height400 mm
Rotation radius12±1 mm
Lateral shaking frequency220±10 times/min
Vertical vibration frequency150±10 times/min
Amplitude10±2 mm
Time setting0-9999.99 seconds or hours, minutes, seconds countdown
Rotational speed2800 RPM
PowerAC 220V± 10% 50HZ , 370W
Dimension800*500*1150mm
Weight130kg


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Beijing United Test Co., Ltd.