Information on the most widely used ASTM standards within the materials testing industry
Model: UT4026A/UT4026P; ISO 11058, ASTM D4491
Geotextile vertical permeability tester is used to determine the vertical permeability performance of geotextiles and their related products under the constant head method. The head of this type of geotextile vertical permeability meter can be adjusted (0-300mm), and can maintain a stable head, and the geosynthetic material permeation test equipment is designed to reduce the head loss, and the box-shaped structure is adopted.
General Introduction
Geotextile vertical permeability tester is used to determine the vertical permeability performance of geotextiles and their related products under the constant head method. The head of this type of geotextile vertical permeability meter can be adjusted (0-300mm), and can maintain a stable head, and the geosynthetic material permeation test equipment is designed to reduce the head loss, and the box-shaped structure is adopted.
What's Permittivity measuring?
Permittivity is measured in accordance with ASTM D4491 and is a method most commonly used in the United States. Permittivity is defined as the flow rate (in cubic metres per second), divided by the area of the geotextile tested, divided by the hydraulic head. ASTM D4491 specifies a hydraulic head of 50mm for testing.

Main features
1. Digital setting of head difference, electric lifting, automatic positioning.
2. Loading samples in water to avoid bubbles during the test and affecting the test results.
ISO 11058:2019 Geotextiles and geotextile-related products - Determination of water permeability characteristics normal to the plane, without load.
ASTM D4491 Standard Test Methods for Water Permeability of Geotextiles by Permittivity
Main Technical Specification
| Maximum water head difference | 300mm |
| The inner diameter of the gripper | 50.5mm (20cm²) can be customized with other specifications |
| Display | digital display of water head difference, 7.8-inch true color touch screen |
| Water Head difference control | 0-300mm digital setting, electric adjustment, automatic positioning |
| Water Head measurement accuracy | 0.2mm |
| The thickness of the testable sample | 0.1~20mm |
| Water level height resolution | 0.01mm |
| Loading method | Loading in water, special loading tools to quickly complete the loading |
| Thermometer range | 0-100°C |
| Time control | 0-99999.9 seconds, arbitrary setting |
| Power supply | AC 220V± 10% 50HZ , 200W |
| Dimension | 1280×700×1600mm |
| Weight | 120kg |
Main accessories
| Item | Quantity |
| Frame | 1 set |
| water loading fixture | 1 set |
| sampling tools | 1 set |
| Measuring cup | 1 pc |
| water inlet pipe | 1 pc |
| Documents (Manual, packing list, certificate) | |
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