AATCC 22 Water Repellency: Spray Test

Purpose of Test

The water repellency spray test evaluates a fabric’s resistance to getting wet with water. This test is primarily used for textile fabrics that may or may not have been treated with a water-repellent finish.

This test is ideal for assessing water resistance of various fabric finishes.

The test results for this method depend on the water repellency of the following materials used:

  • Fibers
  • Yarns
  • Fabric construction
  • Fabric finish

Terminology Defined

Water Resistance – The fabric’s resistance to water wetting and penetration.

Water Repellency – The fabric’s resistance to water wetting.

Visual Rating Scale – The visual chart containing the corresponding ratings for wetted patterns.

Standard Spray Test Rating (Image Source: AATCC)

Test Method

Materials Used for Test

  • Test specimen
  • Visual rating scale
  • Spray test apparatus
Spray Test Apparatus (Image Source: AATCC)

Testing Procedure

The test is performed by evaluating the water spray pattern on the test specimen’s surface under controlled conditions with the use of a visual rating scale.

Test Procedure (Summary)

Part 1: Water spraying: The test specimen is laid flat and stretched out on a surface. Water is sprayed onto the taut fabric under controlled conditions. The wetted pattern depends on the water repellency level of the test specimen.

Part 2: Evaluating water repellency: The water repellency level is evaluated by comparing the wetted pattern to the visual rating scale.

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