Various methods of generating micro porous membranes and coatings are as follows. The ability to transport water vapor and the physiological function of breathable foul weather protective clothing existed at subzero ambient temperatures down to -20°C . These fabrics can be applied as laminates or loose linings according to users’ requirements. 5.2.8 Combination of Micro porous and Hydrophilic Membranes and Coatings. Williams.J.T, “Textiles for cold weather apparel”, Woodhead publications, ISBN 978-1-84569-411-1, (2009). This article is published in two parts, this is the second part. Smaller the diameter greater is the surface energy, greater the tendency of a liquid to move up the capillary. Capillary action is determined by two fundamental properties of the capillary [1,2]: 2.3.1 Capillary’s diameter and surface energy. It transfers more heat and water vapor from inside clothing to outside than ordinary waterproof breathable fabrics. It can protect the water penetration for up to 20 minutes when the wearer is submerged. These fabrics initially are not water proof, but as it comes in contact with water the cotton fibers swell to such an extent that the inter yarn pores of the fabric are significantly reduced and there by restricting the passage of water. At a temperature higher than the transition temperature, the coating exists in collapsed state (due to the predominance of Hydrophobic interactions) resulting in opening of the micro cracks. 8. The crystallinity of polymer should be high, preferably > 98%. To cause low degrees of etherification and produce good water repellency and dry-cleaning resistance, with no loss of vapor permeability was observed . • Lightweight 2.1 Principles of moisture vapor transfer, The Principles of moisture vapor transfer is governed by inter yarn/ inter fiber spaces. Methods of producing waterproof breathable fabrics, Different methods involved to produce breathable fabric, Fig 3: Different layers of breathable fabric. Micro porous membranes have tiny holes on their surface smaller than a rain drops but larger than water vapor molecule. 10.4 Acceptance standard level worldwide for water repellent breathable fabrics. We call this Direct Venting™ technology, and unlike other technologies, it doesn't need to get wet to work. Rudolph D. Deanin AND Dhirajlal C. Patel, Breathable, Permanent Water-Repellent Treatment of C1ot, Textile Research Journal; 40; 970, (1970). The coating contains very fine inter connected channels, much smaller than the finest raindrop but much larger than a water vapor molecule. Also, the water vapor permeability of MENMEF was in a range of normal woven sport and work clothing. For a fire fighting operation, in racer suits and other jobs were higher metabolic activities are carried the body perspires heavily and the fabric should transmit good level of water vapor while protecting the body from external heat and pressure. Some of the membranes are made from Polytetrafluroethylene (PTFE) polymer, Polyvinylidene fluoride (PVDF) etc,. Absorption, transmition and desorption of the water vapor by the fibers. Apurba das and R.Alagiruswamy, “Science in clothing comfort”, Woodhead publications, ISBN 13:978-81-908001-5-0, (2010). 20 Meters/ 787 Inch Microfiber Non-Woven Fabric Waterproof Breathable Disposable Cloth Thickened Non-Woven Fabric 95 Percent Polypropylene Soft Fabric for DIY Handmade Combination Supplies. BS 7209 is a standard widely acceptable throughout the world for the water vapor permeable index (WVPI). eVent fabrics was the first to engineer and use patented Direct Venting technology so rain can't get in but sweat can get out instantly. It transfers more heat and water vapor from inside clothing to outside than ordinary waterproof breathable fabrics. Microfibers do not actually swell when wet. In spite of several methods to produce the fabric, really it is a difficult task as well an opportunity to produce quality products in this area. Expanded polytetrafluoroethylene, or ePTFE, is a material that was developed by Bob Gore and used to create the first Gore-Tex fabrics in … Eastex Medical Fabrics include 100% polyester and polyester-nylon blends offered in several stretch and non-stretch constructions with different coatings to match specific product requirements. Coating solution of an interconnected network of minute pores usually produced by coagulation... R.Alagiruswamy, “ porous polymers and Fusible films ”, ( 2009 ) fig (... T allow the body to be lightweight, stretchy, waterproof and breathable coating and technical! 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