Perhaps you have had this experience: happily wearing their own anti-splashing function of the rain to walk in the rain, walking but feel more and more wrong ...... My clothes are clearly waterproof, why is it still wet?

In fact, "water" and "waterproof" are two different things, what is the difference between the two?

Anti-splashing water, also known as water, English is water repellent, abbreviated as W/R. Anti-splashing water refers to the deposition of hydrophobic compounds on the surface of the fiber, leaving pores on the surface of the fabric, through which air and moisture can also pass. Generally, water droplets (like lotus leaves) are formed on the cloth surface, which is not really waterproof, but reduces the adsorption of water by the fabric, so that water can be "pushed out" on the surface of the fabric, and water will seep into the fabric after a long stay.

Anti-splashing processing uses various chemical materials to attach a layer of ultra-fine "needle bed" to the surface of the cloth, so that the tension on the surface of the cloth is less than the cohesive force of water, so water droplets will roll away instead of spreading out and soaking. If this layer of "needle bed" structure is flattened or covered by oil, the fabric's ability to prevent water splashing will be greatly reduced, and even begin to absorb water. The anti-water effect of the fabric will gradually weaken or even fail with washing and long-term use.

Therefore, when you go out wearing water-repellent clothes on rainy days, you can quickly shake off the water droplets on the surface of your clothes, but whether the clothes inside will be wet depends on the amount of rain and the time you stay in the rain. Water-repellent is not really completely waterproof.

Waterproof:

Waterproof English is water resistant/water proof, which refers to waterproof and moisture-permeable fabric. Generally, it refers to making a rubber bottom on the bottom of the fabric, which is divided into coating and lamination. coating is often said that the coating, lamination refers to the lamination, that is, a composite layer of waterproof material. The vast majority of waterproof fabrics are laminated (film) materials, and there are also capsule fibers, compact fabrics, siliconization and other forms of treatment, and are usually located in the inner layer of the fabric, which is often referred to as "waterproof membrane".

Waterproof membrane is a kind of composite fabric composed of film and other materials through pasting process. The fabric itself is not waterproof. Therefore, when we wear waterproof clothing and encounter wet weather, we will see water seeping into the clothing, just like the clothing of ordinary fabric, but the inner layer of the clothing is dry, which is the waterproof film in the middle of the composite fabric.

The waterproof ability is expressed by the anti-water pressure value, that is, a fixed area of waterproof cloth is used to block the rising water pressure. When the third drop of water seeps out from the surface, the anti-water pressure value of the fabric is usually more than 1000 mmH2O. The most basic waterproof ability can be achieved.