After several days of heavy rain, sometimes it rained and sometimes stopped, someone asked: "When it rains, why do the water droplets on the surface of my jacket not fall off, but even absorb into it? Does it mean that my jacket is no longer waterproof?" ?” That’s because the DWR water-repellent layer of your jacket has gradually disappeared, resulting in a reduction in waterproofness. There are many waterproof products on the market, and waterproof jackets are no longer exclusive clothing for mountaineering, camping, and hiking. Living in the city, we are always faced with the possibility of rainfall. Today, I will show you the differences between different waterproof levels. Where!
Water repellentWater Repellent
Also known as water-resistant and splash-proof , it refers to the hydrophobicity of clothing . A chemical coating is usually attached to the surface of the clothing to make the surface tension of the cloth less than the cohesion of water. When raindrops or moisture come into contact with the surface, Water droplets will form on it and then slide off. This method is called DWR (Durable Water Repellent ). The fabric treated with DWR is not really waterproof , it just reduces the possibility of the fabric absorbing moisture . If the moisture stays for a long time, it will still penetrate.
However, fabrics treated with DWR water-repellent treatment are not permanent , and the water pressure they can protect against is limited . The water-repellent layer of the fabric will gradually weaken with washing, wear, and long-term use , especially when the fabric structure is being used. When washed away by a large water column pressure, the water stays on the fabric for a long time, or when it is covered or penetrated by oil stains, the water-repellent functionality will be greatly reduced and may even fail in the end. Therefore, the situation mentioned in the preface occurs. , "Why the water droplets on the surface of the coat will not slide off, but will even be absorbed into it." This is the reason!
Next is waterproof, completely 100% waterproof! Waterproof and breathable fabrics use weaving methods, materials, additives, etc. to make clothes achieve excellent waterproof functions. They are generally divided into two types: coating and lamination . Coating is often referred to as coating . lamination is a waterproof membrane attached to the back. Most of the waterproof styles on the market are made by laminating (film). The waterproof film is bonded to the surface fabric through a pasting process to form a composite fabric .
(The outer layer of Ultra Coat is treated with DWR water-repellent treatment, and the middle layer is AIRMEM™ nano environmentally friendly coffee waterproof membrane, which has a water pressure resistance of up to 15,000mm, is highly effective in windproof and rainproof, and maintains high breathability)
The surface fabrics used for lamination are not waterproof in themselves and are usually only treated with DWR water repellent treatment. Therefore, when the water repellent layer of a 100% waterproof jacket is weakened, the surface fabric will begin to be penetrated by water, as if Generally, clothing does not have waterproof function, but in fact, no water can penetrate into the inner layer , and it is dry and moisture-free . This is the role of the waterproof film.
Water pressure resistance value (mmH2O)
Usually, a fixed area of waterproof fabric is used to block the rising water pressure. When the third drop of water seeps out from the surface, it is the water pressure resistance value of the fabric. Using the unit square millimeter (mm), the maximum height of the water column pressure it can withstand is , the larger the value, the better the degree of waterproofing ; assuming the waterproof coefficient of the clothing is 15,000mm, it means it can withstand water pressure of up to 15 meters.
Can you tell the difference between "waterproof" and "water-repellent" above? The waterproof function is continuous, but the water-repellent layer will be exhausted with washing and wear . Friends who buy water-repellent related products should not be discouraged. It is recommended to purchase commercially available special water-repellent agents. , spraying regularly and evenly on the surface of the fabric will restore the water-repellent properties of the jacket. In this way, the waterproof jacket worth tens of thousands of dollars will come back to life!
Thank you for watching! I would like to ask if anyone is like the editor, who never takes an umbrella when going out after getting a waterproof jacket. He thinks he looks cool in the rain without an umbrella XD. Please leave a comment below to compare.