Jackets should have a waterproof function, in the physical and chemical performance testing, hydrostatic pressure and water repellency should be satisfied at the same time, it can become a waterproof fabric. Hydrostatic pressure refers to the fabric's ability to withstand high water pressure for a long period of time, while the inner layer is impermeable to water and not wet. The water repellent (surface-wetting resistance) refers to the drop of water on the fabric, such as the dew on the lotus leaf, natural Slip off without leaving any traces.
There are three waterproof standards involved: GB/T 4744-2013 "Testing and evaluation of hydrostatic properties of textiles hydrostatic pressure method", GB/T 4745-2012 "Testing and evaluation of waterproof properties of textiles, water dipping method" and GB/T 21295 -2014 "Technical Requirements for Clothing Physical and Chemical Properties".
Test item 1: hydrostatic pressure
1, according to GB/T 4744-2013 "Textile waterproof performance of the detection and evaluation of hydrostatic pressure method" test, with KPa/cmH2O to represent the hydrostatic pressure value, the greater the test result indicates that the fabric can withstand greater hydrostatic pressure , indicating that the waterproof performance is better.
How large is the hydrostatic pressure? National standards tell you!
GB/T 4744-2013 classifies and evaluates hydrostatic pressure rating and waterproof performance evaluation performance based on different water pressure values. According to the table extracted below, 4KPa has hydrostatic performance, and greater than 35KPa indicates excellent hydrostatic resistance.
2. GB/T 21295-2014 "Technical Requirements for Physical and Chemical Properties of Clothing" will link products with rain protection function to water pressure, requiring that the finished product has a hydrostatic pressure not less than 13 kPa, as required by the rain protection function. The anti-rainstorm function requires a finished product with a hydrostatic pressure not less than 35KPa.â€
With reference to these two standards, with this concept, I believe that you can now be linked to actual needs.
Test item two: surface moisture resistance
1. Test according to GB/T 4745-2012 “Determination and evaluation of water-repellent performance of textilesâ€, evaluate the water-drenching grade of fabrics, and evaluate the waterproof performance of fabrics. The following picture is taken during the test, like a dewdrop on a lotus leaf.
GB/T 4745-2013 on the evaluation of waterproof performance, the water level and waterproof performance evaluation of a one-to-one correspondence, 0 ~ 1 is not equipped with anti-wetting performance, 4-5, 5 with excellent anti-wetting performance.
2. GB/T 21295-2014 “Technical Requirements for Physical and Chemical Properties of Clothing†has made requirements for water resistance. “The water dipping level of finished products with water repellency requirements is not less than Class 4â€. Products that reach this level will be treated with water. The beads can slide naturally and create a lotus effect. For everyone to restore the rating reference map, we see the dark color for the wet condition, 4 is such a rating out.
Jackets waterproof fabrics should meet the national standards for hydrostatic pressure resistance and wettability, respectively. Another assessment index of the Jackets “permeability rateâ€, so stay tuned!
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