The waterproofing of clothing used in the medical sector, tents or outdoor shelters can be measured by means of laboratory tests.
The water vapor permeability of a material is also important data, especially in determining how well a garment will “breathe” by allowing perspiration to escape. This is a major property of outdoor sports textile products, and a essential property for some personal protective equipment, such as firefighter clothing.
In the case of geosynthetic drainage materials, the transmissivity or permittivity, i.e. the rate of water flowing out of a material, will be measured.
- Hydrostatic resistance, liquid impermeability (AATCC 127, ASTM D751, ASTM F1670);
- Water vapor permeability (ASTM E96, ISO 11092);
- Transmissivity of water flow within a drainage layer (ASTM D4716, ISO 12958);
- Permittivity of liquid flow perpendicular to the plane of the measuring geotextile (ASTM D4491, CAN/CGSB-148.1 No. 4);
- Surface wetting, water repellency, contact angle (AATCC 22, CAN/CGSB 4.2 No. 26.2, ASTM D7490);
- Water absorption measurements including volume absorbed, drying rate (AATCC 195, ASTM D570, INDA 10.1);
- Hydrolysis (ISO TR 20432);
- Filtration aperture (FOS following CAN/CGSB 148.1-No. 10), apparent aperture size (AOS following ASTM D4751).
In the field of clothing, sportswear, work uniforms and personal protective equipment, water resistance can also be associated with comfort properties: a textile set that lets water vapor through, dries quickly, etc.
This is a type of test that CTT Group can perform to evaluate the resistance to water penetration, using a hydrostatic column, on textiles and various sealed seams.