Su permeability

Water Permeability
Water Permeability

Waterproof fabrics are fabrics which are manufactured or treated to provide waterproofness against a light rain and water flow. However, these fabrics do not provide full waterproofing if they come into contact with long-term water or if they receive a lot of rain.

The waterproof property of fabrics is called the ability of water to pass through the fabric when water comes into contact with the fabric from a certain angle and with a certain force. Waterproof properties of textile products are given in two ways:

  • The fabric is given a moisture repellent property without changing the appearance of the fabric. In this method, water repellents, such as fatty acids or waxes, are applied to and on the fibers.
  • Fully waterproof fabrics are produced. In this method, the fabrics are coated with a waterproof material, for example rubber.

For physical tests performed in accredited laboratories, standards issued by local and foreign organizations are complied with. The most commonly used standard for water permeability tests is the Federal Standard 191A standard. This standard includes eleven different waterproof tests as textile test methods. Eight of these tests are different water permeability tests and three are for water absorption.

In addition, other standards based on water permeability tests are:

  • TS 243 Waterproofness of fabrics
  • TS 257 EN 20811 / T1 Textile fabrics - Determination of water resistance - Hydrostatic pressure test
  • TS EN ISO 4920 Textiles - Fabrics - Determination of resistance to surface wetting (spray test)
  • ISO 811 Textile fabrics - Determination of resistance to water penetration - Hydrostatic pressure test
  • ISO 9237 Textile - Determination of air permeability of fabrics
  • ASTM D 737 Standard test method for air permeability of textile fabrics

Laboratories must have a strong technological infrastructure and trained and experienced employees in order to provide quality and reliable results.