How To Detect Waterproof Cloth?

Good quality Waterproof fabric In a humid climate for a long time, it can also withstand seepage pressure and no water seepage. For example, long time walking in the rain and rain, kneeling or sitting on wet ground will not seep. Waterproof fabrics are generally divided into PTFE, FEP, PFA and ETFE basic types. The general TPU high permeability film is made up of three in one (surface cloth + film + lining), and it can only reach 5000 of moisture permeability.

How to detect waterproof fabrics?

Waterproof fabrics are assault clothing and so on. outer wear Common fabrics. There are many ways to detect waterproof fabrics. This article only introduces the most commonly used and the most accurate detection methods. At present, the most commonly used testing methods for waterproof fabrics at home and abroad are the standard test method of Japanese industrial standard, which is standard 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 market in the country is also very large. The data of this method are relatively high. ASTM Standards Naturally become the most commonly used method. Most customers use this method for testing now. The test principle of the water vapour pour cup method is that the fabric tested is covered with a moisture permeable cup with distilled water. After fixing it is inverted, the weight of the top loaded balance with a precision of 0.001g is called, and the weight is placed in the position of the wind tunnel row. The temperature and relative humidity of the environment were recorded before the cup entered the environmental chamber with a temperature of 23 degrees, a relative humidity of 50%, and a 2.5m/s of wind speed. The weight and weight of each cup are recorded. Record the weight of 3H, 6h, 9h, 13h, 23h, 26h, 30h and calculate the rate of water vapor transmission by wvt=24* Delta m/ (s*t) formula. The average of the 6 samples was taken as the result of the test, and the average value was multiplied by 24 to g/m2*24h.

The waterproof fabric has two properties: oil repellency, water repellency and water resistance. The highest test results for this fabric are JIS l-1099 B1 and B2 Japanese industrial standard test. Test principle is used as desiccant. The PTFE film is made of rubber hoop on plastic cup and made into a water vapor permeable cup. Before coating the film on the cup, put enough liquid into the steam permeable cup, the volume of the cup is about 2/3. Take 3 samples of 20cm*30cm from each fabric. Each sample is placed on the test support frame. All coatings or laminated fabrics are fixed on the support frame with rubber rings, and the coating or laminated surfaces are facing outwards. The installation of the sample support system is based on the tank which can float in the water temperature of 23 degrees. After testing the quality of the test cup (including samples, desiccant and film) in the upward direction of the film, quickly test the cup upside down and put it into the sample support frame. This assembly method is placed in a constant temperature 30 C + + 2 C device. After 15min, take the thermostat out of the test cup and invert it and measure its weight. These are the most practical methods for testing waterproof fabrics at home and abroad. Most of these waterproof fabrics can achieve waterproof and moisture proof effects.