It is convenient to randomly select the appropriate number of pieces as indicated in the table

• When the maximum wet strength of a fabric is requested, strips of the appropriate width must be cut and the length is at least twice that of the dry test. Each end of each of the strips must be numbered and frayed.
• The test tube is submerged for a period of 1h in class 3 water, in accordance with ISO 3696, at a temperature of (20±2) ºC.

• The upper jaw, allowing it to hang free under its own weight and then guiding it by hand to ensure alignment perpendicular to the line of force, when the jaw is closed.
• The specified pre-tension is applied as indicated.
  1. For all fabrics with elastic properties: 0.5 N
  2. For fabrics without elastic properties, as a function of their mass per unit area:

1. < 200 g/m²: 2N
2. > 200 g/m² a 500 g/m² 5N
3. > 500 g/m²: 10N

• 5 samples are tested in each direction of the warp and weft fabric (pretreated or not depending on the requirement of the classification standard).
• Samples 20x5cm without fringes, in each direction with exact number of threads in the 5cm once frayed.
• Dynamometer with constant speed 100mm/min; one static clamp and the other dynamic until the sample breaks.
• The tissue specimen is stretched at a constant speed until it breaks. Its maximum force and maximum elongation at break are determined.
• If any of the jaw breakage results is higher than the lowest “normal” breakage result, it can be taken into account. If any of the jaw break results are less than the lowest “normal” break result, it should be rejected and further tests performed in order to obtain five “normal” breaks.

The test report must contain the following information:

1. The reference to this part of EN ISO 13934 and the date of the test;
2. The identification of the tested sample and the sampling method.
3. The length, in millimeters, of the assay used.
4. The rate of elongation used in percent per minute or the rate of extension, in millimeters per minute.
5. The applied prestress, in Newtons.
6. The state of the samples.
7. The number of samples tested and the number of tests rejected with the reasons for the rejections.
8. The width of the strip, if not 50 mm +/- 0.5 mm, and the number of threads in the strip.
9. Any deviation from the described operative procedure.
10. The arithmetic mean of the maximum force and, if necessary, of the force at break, in Newtons.
11. The arithmetic mean of the elongation at maximum force and, if necessary, of the elongation at break, in percent
12. The coefficient of variation of the force and the corresponding elongation, in percentage.
13. The 95% confidence limits of the force, in Newtons, and of the corresponding elongation, in percentage.

Calculate the arithmetic mean of the maximum force and, if requested, the arithmetic mean of the force at break, in Newtons, for each direction tested.

• Round the result for values:

• Calculate the arithmetic mean of the elongation at maximum force and, if necessary, at break for each direction tested and round to the nearest:

If needed, calculate the coefficient of variation to the nearest 0.1% and 95% confidence limits for the properties listed.