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AATCC 127 Hydrostatic Pressure Test

Standard:  

AATCC

Method:

AATCC 127

Title:

Water Resistance: Hydrostatic Pressure Test

Purpose & Scope

AATCC 127 Hydrostatic Pressure Test measures the resistance of a fabric to the penetration of water under hydrostatic pressure. It is applicable to all types of fabrics, including those treated with a water resistant or water repellent finish. Water resistance depends on the repellency of the fibers and yarns, as well as the fabric construction. The results obtained by this method may not be the same as the results obtained by the AATCC methods for resistance to rain or water spray.

Principle

One surface of the test specimen is subjected to a hydrostatic pressure, increasing at a constant rate, until three points of leakage appear on its other surface. IPS utilizes hydrostatic testers where the pressure is applied from below the sample.

Samples

Each sample code being submitted for testing should be taken diagonally across the width of the fabric to be representative of the material. A minimum of 3 fabric specimens are taken from each code and are cut into squares at least 200 x 200 mm. Care must be taken with the specimens to avoid excessive handling, folding or contamination of the area to be tested. The person taking the sample should mark the surface to be exposed to water by writing the word “TEST” in the corner.

 

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