In this test, a geosynthetic, geotextile is clamped to yield a clear diameter of 150 mm and a brass cone of 45 degree included angle, having a weight of 1 kg, is dropped through a height of 500 mm. The diameter of the resultant hole is measured with a graduated conical device.
The smaller the hole, the greater the resistance of geosynthetic / geotextile to damage. When used in combination with other direct tensile test results, it provides a convenient means of qualitative comparison.