Some knowledge of tent waterproofing

As we all know, if a tent is not waterproof, the consequences are unimaginable. Now we analyze the waterproofness of tents from the main waterproof indicators of tents. The waterproof index of the tent is expressed in MM (mm). It turns out that there will be an instrument for measuring the waterproofness of the tent fabric in the factory. The tent sample is clamped to a circular kit with a diameter of about seven centimeters. The lower part is a system that can pressurize the water. The water is pressurized by an electric method to determine how much water pressure can be used to pass the water through the tent fabric. As the pressure continues to increase, water drips quickly. After passing through the tent sample, this pressure is not the final result. It will wait until the third drop of water breaks through the tent fabric sample, and the pressure value at this time is the final result. If the pressure value is 1600MM, it means that this tent has a waterproof capacity of 1600MM. This 1600MM is equivalent to a water column pressure of one meter six in order to penetrate the water through the tent fabric. If you want to understand the definition of waterproof performance, I can tell you that the waterproof capacity of general jackets can reach more than 2000MM. The waterproof capacity of the waterproof bags we usually use is 10000 mm, and the waterproof capacity of GORE-TEX is 20000 mm. . For the millimeters used to evaluate water repellency, the same definition for clothing applies.