الفرق بين المواد الطاردة للماء والمواد المقاومة للماء والمواد المقاومة للماء

In the outdoor clothing and textile industries, terms such as “Water Repellent”, “Water Resistant”, and “Waterproof” are frequently used, yet each has a distinct meaning. Without a clear understanding of these terms, it can be quite perplexing to select the fabric that best suits your needs. For instance, some waterproof jackets utilize a special treatment to repel water droplets, while others rely on a coating to prevent water penetration. Additionally, there are waterproof jackets that combine multiple materials to completely block water from seeping through, and in some cases, achieve all three different waterproof functions in the same garment. Understanding the differences and the corresponding testing methods can assist you in choosing the most suitable waterproof fabric for your specific purpose.

Water Repellent (WR)

What does “Water Repellent” mean? Textiles treated with a water – repellent fabric agent cause water droplets to condense and roll off the surface, much like water droplets on a lotus leaf, making it difficult for water to penetrate. This indicates that the interior of the fabric is not completely waterproof; it can only repel water upon contact and shed water droplets. Water – repellent materials are designed to resist water penetration, but they are not entirely waterproof. Instead, they are intended to prevent water from soaking the surface, causing the water to bead up and roll off. This makes water – repellent materials ideal for outdoor gear and clothing that requires both waterproofing and breathability.

It should be noted that the effectiveness of water – repellent fabric may diminish over time. After washing, tumble – drying is usually required to maintain their water – repellent performance. We have optimized the water – repellent additives and added cross – linkers to significantly enhance the durability of the fabric’s water – repellent ability (DWR fabric).

Testing Method

Waterproof tests are commonly used in the textile industry to evaluate fabric performance.

The Spray Test AATCC 22 can determine the water – repellent rating of a fabric. Spray water onto the test fabric for a certain period and rate the water – repellent level based on the surface wetness. The less the fabric is penetrated, the better its water – repellent property.

Rating Explanation

The relevant content of the AATCC waterproof test rating is as follows:

Water Resistant

What is “Water Resistant”? “Water Resistant” refers to the ability of a material or طلاء to resist water penetration to a certain extent. This means that the material can withstand light rain or water splashes without getting saturated.

So, how do we test the water – resistant performance of a jacket? The AATCC 35 waterproof test is a widely used method for assessing water – resistant capabilities. It simulates a rainy scenario by placing absorbent paper behind the fabric and spraying water onto the textile at a certain water column pressure level. After a specified time, measure the weight of the absorbent paper before and after the test. The test is considered passed only if the weight difference is less than 1 gram. Even though the water – resistant effect may not be exactly the same as that of water – resistant materials, water – resistant fabrics can resist water penetration under rapid water contact and water pressure.

The following are three examples of calculating the weight difference of the absorbent paper before and after testing for water – resistant fabrics:

The AATCC 35 test method measures the waterproof performance of a fabric by determining the amount of water that passes through the material within a specified time. Details are as follows:

To calculate the weight difference, simply subtract the weight of the absorbent paper before the test from the weight after the test, and you can obtain the amount of water that passed through the fabric during the test.

ضد للماء

Many people are often confused about whether “water – resistant” is the same as “waterproof”. Although these two terms may appear similar at first glance, there are substantial differences in their waterproof capabilities. The main reason for this lies in the way fabrics achieve their waterproof properties. Fabrics labeled as “water – resistant” typically have a certain degree of resistance to water penetration, often through surface treatments that cause water to bead up and roll off. On the other hand, “waterproof” fabrics usually achieve a higher level of protection by incorporating الطلاءات or laminated waterproof membranes. These additional elements significantly enhance the fabric’s ability to prevent water from seeping through, ensuring complete protection against water ingress even under more demanding conditions.

Achieving natural waterproofing is quite challenging. Most textiles use the AATCC 127 Waterproof Hydrostatic Pressure Test to measure their waterproof capabilities. This test applies water pressure to the front of the fabric until three drops of water appear on the back. The higher the water pressure in the test, the better the waterproof performance.

For example, a waterproof rating of 20,000 mmH₂O is equivalent to being able to withstand a water pressure of 20 meters. This is the waterproof performance standard of the fabrics used in many mountaineering and skiing clothes, providing optimal waterproof protection.

How to Interpret the AATCC 127 Test Results

The following are examples of fabric test results from the AATCC 127 Waterproof Hydrostatic Pressure Test for four different fabrics:

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