Geotextiles are permeable fabrics placed in or on soil to do one or more of five jobs: separation, filtration, drainage, reinforcement and erosion control. They are used in road and railway construction, landfills, embankments, retaining walls, drainage systems and coastal and river works. A buyer sourcing them from India is usually a distributor, a contractor or a project supplier, and the specification is set by the design engineer rather than by the fabric plant.
Most geotextiles are polypropylene or polyester. Polypropylene resists most soil chemistry and is the usual choice for non-wovens, while polyester is stronger and stiffer but is affected by highly alkaline conditions, so it is specified with care where it will touch cement or lime.
The five functions
- Separation: a layer between two soils, typically the sub-grade and the aggregate under a road, that stops them mixing while letting water through, so the aggregate keeps doing its job for the life of the road.
- Filtration: the fabric passes water while holding back soil particles, as in a French drain or behind a retaining wall. Apparent opening size and permittivity are the controlling properties.
- Drainage: thick needle-punched fabrics carry water within their own plane, moving it sideways to an outlet. In practice this is often done with a geocomposite that combines fabric with a drainage core.
- Reinforcement: high-strength woven geotextiles or geogrids carry tensile load that soil cannot, as in embankments over soft ground, reinforced slopes and working platforms.
- Erosion control: fabrics and mats protect slopes, channels and shorelines from water and wind, often beneath rock armour or as sand-filled geotextile tubes and containers.
Where they are used
Roads and railways use separation and reinforcement fabrics beneath the pavement or ballast. Landfills use heavy non-wovens as cushion layers that protect the geomembrane liner from puncture by drainage stone. Coastal and river works use heavy woven and non-woven fabrics beneath rock revetments and in geotextile tubes filled with sand. Agriculture and landscaping use lighter weights for weed control, drainage and ground cover.
What a buyer should ask for
Buy geotextiles by test value, not by GSM alone. The design will specify wide-width tensile strength and elongation, CBR puncture, permittivity or permeability, apparent opening size and sometimes UV resistance, and the fabric should be tested against those numbers rather than against the plant's catalogue. Two fabrics of the same weight can differ widely in strength and flow depending on fibre, process and finishing.
Indian producers in Gujarat make both woven and needle-punched geotextiles, and the ports of Mundra, Kandla (Deendayal), Hazira and Pipavav are close to the plants, which keeps inland freight low. Rolls are usually wrapped and shipped in standard containers, so the main logistics question is roll width and length rather than weight.
How we help
We visit geotextile plants in Gujarat, audit their looms and needling lines, and send sealed samples to an NABL-accredited lab against the values in your design specification. We inspect the rolls before shipment, supervise loading and send a weekly update, with one approved supplier and one backup. A free 20-minute sourcing review is a good place to start if you have a project specification in hand.