Hydrostatic Pressure Test for Fabric



The hydrostatic pressure resistance index is one of the most important indicators of waterproof and breathable fabrics. Hydrostatic pressure refers to the resistance water encounters as it passes through fabric. Under standard atmospheric pressure conditions, the fabric is subjected to continuously rising water pressure. Until water droplets seep out from the back of the fabric, at this time, the measured water pressure value is the hydrostatic pressure. The more hydrostatic pressure a fabric can withstand, the better its waterproofness or resistance to leakage.

The units expressing hydrostatic pressure are N/m2，kPa and water column height m. The conversion relationship is that the height of the water column of 1m is equal to 9. 82 kPa.Paragraph. 单击此处进行编辑.

Hydrostatic pressure tester

The YG812 digital water permeability tester uses the spray method to measure the permeability of materials. Clamp the sample in the fixture of the test bench, and inject a certain amount of water through the water inlet pipe from above. The water will penetrate through the sample to the bottom of the test bench, and a certain amount of water will flow out of the outlet pipe at the bottom. Based on the amount of water flowing out of the outlet pipe and the penetration area of the sample, the permeability coefficient of the material can be calculated to determine the water permeability performance of the material.
Hydrostatic pressure with range from 0 to 200kPa;Pressure applied on specimen pass through a buffer device to effectively avoid over-pressured; There is a calibration port in control box . If need to calibration the machine ,Firstly open the back cover of contraol box and pull out the plug .
Click to get more information about hydrostatic pressure tester

Factors affecting the water pressure resistance of fabrics

  • Tightness of fabric. The increase in the distance between yarns will directly affect the water pressure resistance. Generally, the tighter the fabric structure, the better its water resistance.
  • The size of the pore size of the coating film. The larger the pore size of the membrane, the worse the hydrostatic pressure resistance of the coated fabric.
  • The size of the contact angle 0. When 0>90, the fabric has water-repellent properties. At this time, as 0 increases, the water pressure resistance value of the fabric also increases accordingly.
  • Coating thickness. If the coating is too thin, the coating agent will not easily form a continuous film on the surface, and the water pressure resistance of the coated fabric will be reduced; if the coating is thick, the water pressure resistance of the fabric will increase.
  • Thickness of fabric. The thicker the fabric, the greater the moisture resistance and the greater the water pressure resistance value.
  • Thickness of yarn. For compact fabrics made of fibers with good hygroscopicity, the yarn radius is reduced due to the existence of capillary effect. It can improve the water resistance of fabrics.
  • The performance of warp and weft yarns. Under the action of water pressure, elastic warp and weft yarns are easy to elongate, resulting in the formation of gaps between adjacent warp and weft yarns, through which water droplets can easily penetrate, reducing the water pressure resistance of the fabric.
  • Coating quality. The entire cloth surface is required to be uniform and have a certain degree of fastness. The better the coating quality, the better the water penetration resistance.

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