The NWSP 80.6 standard is one of the Nonwoven Standard Procedures (NWSP), which was developed jointly by the leading global nonwoven associations, European Disposable and Nonwoven Association (EDANA) and the Nonwoven Fabric Manufacturers Association (INDA), which technically defines nonwoven products in terms of properties and composition. Nonwoven standard procedures (NWSP) are designed to provide a standard set of test methods for the various properties desired in nonwoven and engineered fabrics. The water resistance test defined in standard NWSP 080.6 applies to any nonwoven fabric intended for use as a barrier against the penetration of liquids. This test is intended to measure the resistance of nonwoven fabrics to water penetration under various hydrostatic head pressures.
-testi.jpg "NWSP 80.6 Water Resistance (Hydrostatic Pressure) Test")
When testing certain fabrics, such as meltblown fabrics, a nylon mesh or mesh screen is sometimes used to support the sample. This simulates the effect of an adhered laminate and prevents the weight of water from tearing or stretching the material. If this technique is used, it should be reported with the test results.
When performing the test as defined in the NWSP 80.6 standard, a nonwoven fabric sample is mounted to form the cover in the test head chamber. This sample is subjected to a standardized water pressure rise at a constant rate until leakage appears on the outer surface of the nonwoven fabric. For the hydrostatic water pressure test, test results are measured at the point where the first drops appear in three separate areas on the sample. Generally, results are reported in centimeters/minute. The rate of increase of water pressure should be 10 plus/minus 0,5 cm or 60 plus/minus 3 cm H2O/min. Using these two different ratios can yield different results. Which ratio is used should be reported in the test results.
Performance characteristics for industrial, medical and military fabrics have been prepared on the basis of water penetration resistance and are used to purchase fabrics where water penetration resistance is of interest. Construction factors and finishing techniques can have an impact on a finished product's resistance to water penetration. Also, the quality of the stitches can affect the results.
Our organization also provides water resistance (hydrostatic pressure) testing services within the scope of NWSP 80.6 standard, with its trained and expert staff and advanced technological equipment, among the numerous test, measurement, analysis and evaluation studies it provides for businesses in various sectors.
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