Water repellent, also known as water repellent, abbreviated as W/R, is a hydrophobic compound deposited on the surface of the fiber. There are pores on the surface of the fabric, and air and water vapor can still pass through (through post-finishing). Generally, it will Form water droplets (like lotus leaves) on the cloth. But it is not really waterproof, water will still seep inside if it stays for a long time. W/R treated fabrics will lose effectiveness due to washing and prolonged use. (The water-repellent here should include what we often call water-repellent, as well as waterproof.)
Commonly performed tests include: AATCC 22-2005 Textile Water Repellency Test-Spray Method
AATCC 193-2005 Anti-wetting: Waterproof/Ethanol Solution Test,
AATCC 118-2007 Oil Drainage: Hydrocarbon Resistance Test
GB12799-1991 Safety and Hygiene Performance Requirements for Oil- and Water-Repellent Protective Clothing (Abolition, No New Standard Replacement)
Waterproof, water resistant/water proof (here should refer to waterproof and breathable fabrics), generally refers to making a rubber base on the bottom of the fabric, which is divided into two types: coating and lamination. Coating is often referred to as coating, and lamination is A layer of waterproof material is compounded on the back. This is true waterproofing. Generally, the surface of waterproof fabrics is divided into those with W/R and without W/R. W/R+W/P is certainly better than pure W/R or W/P.
Test standards include: BS EN 20811-1992 Determination of water penetration resistance of textile fibers Hydrostatic pressure test
In terms of specific performance, it can be distinguished from two aspects:
(1)
Waterproof products are more durable than water-repellent products and have more stable physical and chemical properties
Waterproof products generally do not lose their effectiveness due to washing and prolonged use.
(2)
Waterproof products have higher water pressure resistance indicators than water-repellent products, usually at least 3000MM.
(3)
Applied to the specific function of clothing, the main function of water-repellent treatment is to reduce the adsorption of water by the fabric, so that water can be “pushed away” on the surface of the fabric; the waterproof treatment is a completely impermeable barrier, regardless of whether the fabric absorbs water or not. It all keeps water out.
(4)
Waterproof products need to be tested for water pressure resistance, while water-repellent products need to be tested for exposure to rain. The latter generally does not have a coating, but uses super water-repellent additives, whose additives are mainly organic fluorine compounds.
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