Press release
Common Water Vapor Permeability Testing Methods for Functional Fabrics
Logo SGS SA
Many outdoor jackets or rainwear may be labeled with functional claims such as waterproof breathable. The shell fabrics may be treated with finishes, coating or lamination to achieve the waterproof breathable function. However, if an improper treatment is applied, it may reduce the breathability and therefore inhibit the evaporation of sweat from skin, which may cause discomfort. There are various methods used to assess the water vapor permeability of textiles. The tables below summarize the common methods and their differences.
Comparison of Testing Methods for Water Vapor Permeability
ASTM E96
- Cup methods
- Upright cup for water permeable fabric
- Inverted cup for water impermeable fabric
JIS L 1099
- Cup methods
- Upright cup for water permeable fabric
- Inverted cup for water impermeable fabric (for single membrane method)
- Inverted cup for water permeable or water impermeable fabric (for double membrane method)
ISO 15496
- Cup method
- Inverted cup for water permeable or water impermeable fabric (double membrane method)
BS 7209
- Cup method
- Only upright orientation
- Cup is moving on a turntable
ISO 11092 / ASTM F1868
- Sweating hot plate method
- Simulate sweating skin
- Commonly applied to water impermeable fabric
Various Water Vapor Permeability Testing Methods and Procedures
Water Vapor Transmission ASTM E96, JIS L 1099,ISO 15496, Water Vapor Permeability (WVP), BS 7209 and differences between BS 7209 and other cup methods as well as differences between cup methods and sweating hot plate methods are summarized within the latest Safeguards bulletin (http://newsletter.sgs.com/eNewsletterPro/uploadedimages/000006/sgs-safeguards-16213-technical-update-review-of-common-water-vapor-permeability-testing-methods-a4-en-13.pdf).
About SGS Softlines Services
SGS Global Softlines has an extensive network of over 40 laboratories worldwide, with a strong team of committed professionals from multi-disciplinary backgrounds. The SGS internationally accredited state-of-the-art testing laboratories offer a comprehensive range of physical, chemical and functional testing services for components, materials (http://www.sgs.com/en/Consumer-Goods-Retail/Softlines-and-Accessories/Textile-and-Clothing/Testing/Material-Testing.aspx) and finished products. SGS can help your company ensure quality, performance and compliance with international, industrial and regulatory standards worldwide.
Please do not hesitate to contact an SGS expert for more information.
SGS is the world’s leading inspection, verification, testing and certification company. SGS is recognized as the global benchmark for quality and integrity. With more than 75 000 employees, SGS operates a network of over 1 500 offices and laboratories around the world.
Contact details:
SGS Consumer Testing Services
Kris Wan
Global Softlines Senior Business Development Manager
SGS Hong Kong
t: +852 2334 4481
Email: cts.media@sgs.com
Website: www.sgs.com/softlines
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