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Dacron, a textile, has a nice property that way.
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The other material that's used often is a material
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you're familiar with called GORE-TEX.
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GORE-TEX is basically Teflon,
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its Teflon that is treated
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in a special so that it becomes porous.
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One of the properties of Teflon,
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you use it as cookware, for example,
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because things don't stick to it.
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It's not a sticky polymer,
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it's fairly inert to particularly proteins
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that might stick on the surface.