Static puncture strength

ASTM D6241 Standard Test Method for Static Puncture Strength of Geotextiles and Geotextile-Related Products Using a 50-mm Probe 

The CBR test specifies a method to determine puncture resistance by measuring the force required to push a flat-ended plunger through geosynthetics clamped between two steel rings. Maximum push-through force and displacement at maximum force are measured. The test is applicable to most types of GTXs (Table 7.8 and Fig. 7.15). 

ASTM D4833 Standard Test Method for Index Puncture Resistance of Geomembranes and Related Products 

In the past, the puncture index test was also used for GTX. This test is similar to the static puncture test (CBR) but a different plunger (0 8 mm) is used and the specimen is smaller. CBR tests have replaced the puncture index test because the CBR test gives more consistent results than the small puncture index test. 

Push through force Maximum value Initial maximum value (in case of double peak) 

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As the proportion of reclaimed fibres rises, stamping force (static puncture strength, CBR test) declines. The reason is the same as with maximum tensile strength. 

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