ISO_4920 2012 Determination of moisture resistance of fabric surfaces: Spray test

1.Purpose and Scope:

Use the spray method to determine the surface moisture resistance of fabrics with or without water-repellent finishing;

This method cannot be used to predict the rain penetration of fabrics because the amount of water that penetrates the fabric cannot be measured.

2. Principle:

Spray the sample with the specified volume of distilled or deionized water. The sample is installed on the snap ring and placed at an angle of 45°C to the horizontal plane. The center of the sample is located at the specified distance below the nozzle. According to the appearance of the sample and the evaluation standards and Compare the pictures to evaluate the level of water staining.

3. Equipment preparation:

3.1 Water-facing device, metal nozzle, sample holder, graduated cylinder;

3.2 Distilled or deionized water.

4.Standard atmosphere for humidity control and testing:

Humidification and testing shall be carried out in accordance with the standard atmospheric conditions specified in ISO 139. Humidification and testing may be carried out at room temperature by mutual agreement.

5.Sample:

Take at least three samples from different positions of the fabric, 180mm square, and take samples from different positions of the sample to ensure that the sample is representative and can be safely clamped on the sample holder; it should be noted that when sampling, try to Be representative and do not take samples from locations with wrinkles or creases.

6. Definition of spray level:

Level 0—-Both sides of the sample are completely wetted;

Level 1—all wetted surfaces;

Level 2—Half of the wetted surface is wetted, which usually refers to the sum of small discrete wetted areas;

Level 3—The wetted surface only has a small discontinuous area of wetting;

Level 4—The shower surface is not wetted, but there are small water droplets on the spray surface;

Level 5—The surface being showered is not wetted, and there are no small water droplets on the spray surface;

In summary, this standard further evaluates the moisture resistance of fabrics by testing the surface moisture resistance of fabrics with or without water-repellent finishing.

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