"Filter fabric" is a generic term used to describe geotextiles whose primary function is allowing water to pass while keeping soil fines from migrating through the fabric. US Fabrics offers a complete line of geotextile filter fabrics.
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There are three types of geotextile filter fabrics: needle punched nonwoven, DuPont&#; spunbond nonwoven, and woven monofilament. The most commonly used are needle punched nonwovens. These popular fabrics are used in applications such as wrapping a perforated pipe or the gravel in a French drain. There are also nonwovens robust enough for heavy duty filtration applications such as placement under rip-rap for shoreline erosion control.
In cases where fine grain sands (beach sands) are present, a woven monofilament is required. Monofilaments prevent the clogging that can occur when fine particles migrate into the matrix of a needle punched nonwoven and get stuck. Unlike nonwovens, woven monofilaments have a unique property called percent open area that prevents clogging. Monofilaments also offer higher strengths than nonwovens.
For more information, please visit Industrial Filter Fabric.
Sometimes &#;filter fabric&#; is used incorrectly to describe woven separation and stabilization geotextiles. While these products do allow water to pass, they can clog and do not have the flow rates and permittivity of true filter fabrics.
Definition of Filter Fabric in Construction
A material that is designed to allow water to flow thru but retain sand, sedimentation materials , soils, etc. that are in the water.
This fabric is used to reduce material flowing into a stream or body of water, or to retain the fines and material from leaching out of a system. Filter fabrics are used extensively in the stabilization of project sites that have less than perfect soil conditions. In addition to filtering out fines, fabrics are also used to encompass controlled stone and bagged stone, to create drainage behind walls, or other impervious structures, that may hold back an accumulation of water. Filter fabric is used to keep a footing drain free of silt and debris as well as ensure a drywell remains sediment free. Filter fabrics are extremely common in the construction industry and are improving in performance as technology advances.
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