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Nonwoven Fabrics

Nonwoven fabrics can be made of either polyester or polypropylene but the majority of nonwoven fabrics used in the US are made of polypropylene staple fiber and are needle punched. Nonwoven filter fabrics are used as separation fabrics when higher water flow is required for the application. This can include acting as a separator between the drainage gravel backfill behind a retaining wall, wrapping the stone surrounding the pipe in a french drain, or as an underlayment below riprap. Nonwoven fabrics can also be treated to resist water flow and used as a pavement underlay by binding with the asphalt to create a barrier to water.
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