How to test the waterproof performance of oil- and water-repellent fabrics?
Good quality waterproof fabrics can withstand the pressure of water seepage and do not seep water even if they are exposed to humid climate environments for a long time.
For example, if you walk outdoors in wind and rain for a long time, kneel or sit on wet ground, there will be no water leakage.
Waterproof fabrics are generally divided into several basic types: PTFE, FEP, PFA, and ETFE. The general TPU high-permeability film can only achieve three-in-one (face fabric + membrane + lining) Moisture permeability of 5000.
How to detect waterproof fabric?
Waterproof fabric is a commonly used fabric for outdoor clothing such as jackets.
There are various testing methods for waterproof fabrics. This article only briefly introduces several methods that are commonly used and have accurate testing results.
At present, the commonly used waterproof fabric testing methods at home and abroad mainly include the Japanese Industrial Standard Testing Method of Water Vapor Cup Method Standardized by the American Society for Testing and Materials.
The United States has always been in the leading position in the waterproof fabric industry, and the country’s market is also very large. The test data of this method is also relatively high, and the ASTM standard has naturally become a commonly used method.
Most customers now use this method for testing.
The test principle of the water vapor inverted cup method is to cover the fabric to be tested on a moisture-permeable cup filled with distilled water, fix it and turn it upside down, and weigh it using a top-loading balance with an accuracy of 0.001g. , and place it in the position of the wind tunnel row.
Before the cup enters an environmental chamber with a temperature of 23°C, a relative humidity of 50%, and a wind speed of 2.5m/s for weighing, record the temperature and relative humidity of the environment.
The weight of each cup and the time it took to weigh it were recorded. Record the weight at 3h, 6h, 9h, 13h, 23h, 26h, and 30h, and use the formula wvt=24*△m/(s*t) to calculate the water vapor transfer rate. The average value of 6 samples is used as the test result. The average value is multiplied by 24 and converted to the result in g/m2*24h.
Waterproof fabrics are textiles that are oil-repellent, water-repellent and water-pressure resistant.
The method for testing this kind of fabric with high results is JIS l-1099 b1, b2 Japanese industrial standard testing.
Test principle as a desiccant.
Hoop the ptfe film on the plastic cup with a rubber ring to make a water vapor permeable cup.
Before wrapping the film on the cup, put enough liquid into the water vapor-permeable cup to fill about 2/3 of the cup’s volume.
Take out 3 samples of 20cm*30cm square from each fabric. Each sample is placed on a test support frame.
All coated or laminated fabrics are secured to the support frame with rubber rings, with the coated or laminated side facing out.
The sample support system must be installed to be able to float in a water tank with a water temperature of 23°C. After testing the quality of the test cup (including sample, desiccant and film) with the film facing upwards, quickly turn the test cup upside down and place it into the sample holder. This assembly method is placed in a constant temperature device of 30℃±2℃.
After 15min, take the test cup out of the thermostatic device, turn it upside down and measure its weight.
The above are the practical methods for testing waterproof fabrics at home and abroad. Most waterproof fabrics that pass these testing methods can achieve waterproof and moisture-proof effects.
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