Durable water repellent: Difference between revisions
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[[File:A water droplet DWR-coated surface2 edit1.jpg|thumb|right|400px|alt=A shiny spherical drop of water on blue cloth|Fluorine-containing durable water repellent makes a fabric water-resistant.]] |
[[File:A water droplet DWR-coated surface2 edit1.jpg|thumb|right|400px|alt=A shiny spherical drop of water on blue cloth|Fluorine-containing durable water repellent makes a fabric water-resistant.]] |
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'''DWR (durable water repellent)''' is a coating added to [[fabrics]] at the factory to make them water-resistant (or [[Hydrophobic_effect|hydrophobic]]). Most factory-applied treatments are [[fluoropolymer]] based.<ref>http://www.easterncolor.net/durh2orp.htm</ref> Durable water repellents are commonly used in conjunction with [[waterproof fabric|waterproof breathable fabrics]] such as [[Gore-Tex]] to prevent the outer layer of fabric from becoming saturated with water. This saturation, called 'wetting out,' can reduce the garment's breathability (moisture transport through the breathable membrane) and let water through. As the DWR wears off over time, re-treatment is recommended when necessary. Many spray-on and wash-in products for treatment of non-waterproof garments and re-treatment of proofed garments losing their water-repellency are available from sources of sporting apparel. Sprays are made by Grangers, Nikwax, McNett, Trek7, and others. |
'''DWR (durable water repellent)''' is a coating added to [[fabrics]] at the factory to make them water-resistant (or [[Hydrophobic_effect|hydrophobic]]). Most factory-applied treatments are [[fluoropolymer]] based.<ref>http://www.easterncolor.net/durh2orp.htm</ref> Durable water repellents are commonly used in conjunction with [[waterproof fabric|waterproof breathable fabrics]] such as [[Gore-Tex]] to prevent the outer layer of fabric from becoming saturated with water. This saturation, called 'wetting out,' can reduce the garment's breathability ''''''''WHEN GAS IS CREATED THROUGH THE ANUS IT SMELLS UN-PLEASANT'''''''' (moisture transport through the breathable membrane) and let water through. As the DWR wears off over time, re-treatment is recommended when necessary. Many spray-on and wash-in products for treatment of non-waterproof garments and re-treatment of proofed garments losing their water-repellency are available from sources of sporting apparel. Sprays are made by Grangers, Nikwax, McNett, Trek7, and others. |
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Older methods for factory application of DWR treatments involve applying a solution of a chemical onto the surface of the fabric by spraying or dipping. More recently the chemistry is applied in the vapor phase using Chemical Vapor Deposition (CVD) machinery. The advantages of CVD include: (1) It eliminates the use of hazardous and environmentally harmful solvents in the application process; (2) The process requires less chemical; (3) the waterproof layer is extremely thin and has less effect on the natural [[look and feel]] of the fabric. Later advances have eliminated [[Perfluorinated compound|perfluorinated acids]], considered to be potentially hazardous to human health by the [[US Environmental Protection Agency]],<ref>http://www.epa.gov/oppt/pfoa/pubs/faq.html#fluoropolymers</ref> from the application process. {{Citation needed|date=October 2010|reason=for this entire paragraph}} |
Older methods for factory application of DWR treatments involve applying a solution of a chemical onto the surface of the fabric by spraying or dipping. More recently the chemistry is applied in the vapor phase using Chemical Vapor Deposition (CVD) machinery. The advantages of CVD include: (1) It eliminates the use of hazardous and environmentally harmful solvents in the application process; (2) The process requires less chemical; (3) the waterproof layer is extremely thin and has less effect on the natural [[look and feel]] of the fabric. Later advances have eliminated [[Perfluorinated compound|perfluorinated acids]], considered to be potentially hazardous to human health by the [[US Environmental Protection Agency]],<ref>http://www.epa.gov/oppt/pfoa/pubs/faq.html#fluoropolymers</ref> from the application process. {{Citation needed|date=October 2010|reason=for this entire paragraph}} |
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Revision as of 15:11, 25 October 2012
DWR (durable water repellent) is a coating added to fabrics at the factory to make them water-resistant (or hydrophobic). Most factory-applied treatments are fluoropolymer based.[1] Durable water repellents are commonly used in conjunction with waterproof breathable fabrics such as Gore-Tex to prevent the outer layer of fabric from becoming saturated with water. This saturation, called 'wetting out,' can reduce the garment's breathability '''WHEN GAS IS CREATED THROUGH THE ANUS IT SMELLS UN-PLEASANT''' (moisture transport through the breathable membrane) and let water through. As the DWR wears off over time, re-treatment is recommended when necessary. Many spray-on and wash-in products for treatment of non-waterproof garments and re-treatment of proofed garments losing their water-repellency are available from sources of sporting apparel. Sprays are made by Grangers, Nikwax, McNett, Trek7, and others.
Older methods for factory application of DWR treatments involve applying a solution of a chemical onto the surface of the fabric by spraying or dipping. More recently the chemistry is applied in the vapor phase using Chemical Vapor Deposition (CVD) machinery. The advantages of CVD include: (1) It eliminates the use of hazardous and environmentally harmful solvents in the application process; (2) The process requires less chemical; (3) the waterproof layer is extremely thin and has less effect on the natural look and feel of the fabric. Later advances have eliminated perfluorinated acids, considered to be potentially hazardous to human health by the US Environmental Protection Agency,[2] from the application process. [citation needed]
Re-treating garments
Durable water-repellent finishes tend to wear off over time, and fabrics need to be re-treated to maintain water-repellency. Washing the garment first helps any DWR that remains to work better; a subsequent treatment with a 'spray-on' or 'soak-in' treatment will improve water-repellency.
See also
References
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