NewsInformation Center
Textile Water-Vapor Permeable and Liquid-Water Test method
2018/11/14
Share:
These textiles allow vapor to pass through but not liquid. Thus perspiration vapor readily departs from the skin, while water outside the garment cannot enter. The inside of the garment remains free of moisture droplets and the wearer stays warm and dry. Water-vapor permeable means the vapor emitted from the surface of an exercising body can evaporate outside the textile, so the temperature decreases and maintain the comfortableness from dryness. Liquid-water impermeable means the textile resists water penetration. Most commonly, the surface of this type of textile is coated with PU, PTFE, TPU, TPE or other materials. The same effect can also be achieved by laminating fabric to a water-impermeable film.
Test method：
1、Testing method for the textiles performance in water-vapor resistance FTTS-FA-005 4 Refer to ISO 11092, the testing condition shall be set in 35℃, 40±3 % relative humidity and air speed to 1 m/s, adjust the hot plate to the temperature of 35℃.Test specimens shall be placed flatly in the hot plate, record the heat flux of hot plate reaching the steady state, calculate the water-vapor resistance of tested specimens.
2、Testing method for the textiles performance in water resistance Refer to ISO 811, the water shall be distilled or fully deionized water maintained at either 20±2℃ or 27±2℃, the rate of increase of water pressure shall be 60±3 cmH2O/min, record the water pressure at which the water penetrates the fabric at the third place is noted.
3、Testing method for the textiles performance in durability of home laundering Refer to ISO 6330 procedure 6A, wash by wascator (tumble washer) and dry flat;or choose ISO 6330 procedure 7A alternatively.
4、Testing method for the textiles performance in flexing resistance Refer to ISO 7854 method C, cut specimens in size of 22cm×19cm with longer dimension paralleling to the longitudinal and transverse direction of the material respectively. Each test piece shall be sewn into a cylindrical shape 19cm long × 6.4cm inside diameter. Condition the specimens in the -20℃ for 24 hours, mount the cylindrical test piece between the two discs. One disc shall be capable of moving at 152 compression strokes per minute; the second disc shall be at the speed of 200 twist insertions per minute. Set the apparatus in motion and stop it after specified number of flexes, assess the flexing damage.
5、Testing method for the textiles performance in adhesive strength
Refer to ISO 2411, take five test specimens cut with the length parallel to the longitudinal and transverse direction respectively. Separate the layers of test specimen 5cm along with its longer dimension. Clamp each side by the jaw of the tensile strength testing machine, separating the layer of specimen in the specified speed to determine the adhesive strength. Where the layer is not sufficiently strong to be stripped, choose the seal of HIPSTER, model no. HP168 or other correspondent with the good adhesive property, bonded with the layer of test specimen by heat to determine the adhesive strength accordingly. When the three-layered material is tested, each combination shall be tested respectively and choose the lower adhesive strength in bonding to be reported.
Previous: Fabric Waterproof and moisture permeability performance test
N e x t : Glow Wire Test Method
