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Thread: Gor-Tex

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    Gor-Tex

    As it is the rainy season in Seattle and I am relegated to the bus and walking I sprung for a Gor-Tex rain shell, $249. It was worth it.

    It works as advertised. Heavy rain rolls off and you do not sweat much and get that clammy feeling. Watched a show segment on how it is made. Serendipity and blind luck works.

    https://en.wikipedia.org/wiki/Gore-Tex

    Gore-Tex was co-invented by Wilbert L. Gore and Gore's son, Robert W. Gore.[1] In 1969, Bob Gore stretched heated rods of polytetrafluoroethylene (PTFE) and created expanded polytetrafluoroethylene (ePTFE). His discovery of the right conditions for stretching PTFE was a happy accident, born partly of frustration. Instead of slowly stretching the heated material, he applied a sudden, accelerating yank. The solid PTFE unexpectedly stretched about 800%, forming a microporous structure that was about 70% air.[1] It was introduced to the public under the trademark Gore-Tex.[2]

    ]The simplest sort of rain wear is a two layer sandwich. The outer layer is typically nylon or polyester and provides strength. The inner one is polyurethane (abbreviated: PU), and provides water resistance, at the cost of breathability.

    Early Gore-Tex fabric replaced the inner layer of PU with a thin, porous fluoropolymer membrane (Teflon) coating that is bonded to a fabric. This membrane had about 9 billion pores per square inch (around 1.4 billion pores per square centimeter). Each pore is approximately ​1⁄20,000 the size of a water droplet, making it impenetrable to liquid water while still allowing the more volatile water vapour molecules to pass through.

    The outer layer of Gore-Tex fabric is coated on the outside with a Durable Water Repellent (DWR) treatment. The DWR prevents the main outer layer from becoming wet, which would reduce the breathability of the whole fabric. However, the DWR is not responsible for the jacket being waterproof. Without the DWR, the outer layer would become soaked, there would be no breathability, and the wearer's sweat being produced on the inside would fail to evaporate, leading to dampness there. This might give the appearance that the fabric is leaking, but it is not. Wear and cleaning will reduce the performance of Gore-Tex fabric by wearing away this Durable Water Repellent (DWR) treatment. The DWR can be reinvigorated by tumble drying the garment or ironing on a low setting.[14]

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    Note that you can also buy stuff to wash it with that will help renew the benefit.

    Also, North Face has a new material that's reportedly far superior to GoreTex, but it's still quite pricey and not all garment types are even available yet.

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