Due to the very large number of tests offered, descriptions of those most commonly requested have been gathered into the following groups:

ASTM D4533 – Trapezoid Tearing Strengths of Geotextiles

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ASTM D4533 covers the determination of the force required continue to propagate a tear in woven or non-woven geotextiles.

Specimens are 3 inches wide by 8 inches long and marked with an isosceles trapezoid. A preliminary 0.625 inch long cut is made on the specimen. The specimen is clamped along the marked trapezoid and then pulled in tension at a constant crosshead speed. The maximum force is recorded and reported as the tearing strength.

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References: ASTM D4533- Standard Test Method for Trapezoid Tearing Strength of Geotextiles