The waterproof nylon fabric refers to the ability of fabric to be completely impervious to water under the condition of applying water pressure, to be permeable to water vapor in daily use, and to maintain this characteristic throughout its service life. The essence is that there is a huge difference between the volume of water vapor molecules and water droplets. In order to improve the waterproofness, it is usually required that the outer surface of this fabric is not easily wetted. The American Association of Textile Chemists and Dyers (AATCC) and the American Society for Testing Materials (ASTM) define repellency as the ability of fabric to resist permeation or both.

There are two ways for liquid water to enter the inside of the garment through the fabric of the garment:

1. After external water such as rainwater or snow water contacts the fabric, the fabric is wetted, and water is transported to the inside of the fabric and other parts of the fabric surface through various crevices and holes in the fabric by capillary effect. This situation is mainly related to the surface energy and surface roughness of the fabric and is a spontaneous process.

2. Under a certain external pressure or its own kinetic energy, water directly passes through the slit holes in the fabric and enters the inside of the fabric. This situation is not only related to surface energy and surface roughness, but also largely depends on the size of the larger slit holes in the fabric. Therefore, the waterproof problem of the fabric must include preventing the fabric from being wetted by water, liquid water infiltration and penetration.

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