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Water Penetration (Spray Impact Test) of Nonwoven Fabrics
The NWSP 80.3 Water Penetration test is applicable to fabrics that are expected to exhibit a degree of water resistance or water repellency.
The SI values are regarded as the official standard system of measurement for this standard test method. If other systems of measurement are used in place of SI units (including inch-pound) their values must be reported independently. Systems of measurement must not be combined in any way, but shall be regarded and reported separately.
This test method is not recommended for highly porous fabrics that are penetrated by large amounts of water.
This method measures the resistance of nonwoven fabrics to the penetration of water by impact and can thus be used to predict the probable rain penetration resistance of the fabric. The sample is used as a protective barrier covering a sheet of pre-weighed absorbent blotter paper. A specific volume of purified water is then sprayed onto the sample and the blotter weighed again. The difference in the two weights is a measure of the amount of water passing through the barrier. The greater the difference, the more water that has passed through, i.e., the less water repellent the nonwoven fabric. Thus, higher numbers indicate lower water resistance.
The results obtained with this method depend on the water repellency of the fibers or the treatment applied to the finished material.
Customer must specify side to test. Test is done using Ahlstrom Grade 989 blotters that meet method requirements. Customer must request ANSI/AAMI equivalent blotters when required. IPS conditions the samples at 65% RH and 21°C and then tests them at 50% RH and 23°C.
SGS-IPS cannot sell or otherwise provide standards, specifications, or test procedures to third parties.