Woven geotextiles give high tensile strength at low elongation, which suits reinforcement and stabilisation, while non-woven geotextiles give permeability and filtration, which suits drainage, separation on wet ground and protection of liners. The two are made in different ways, judged by different test values and should not be swapped on price alone. The design engineer's specification will usually make clear which is intended.
A woven geotextile is made from polypropylene or polyester tapes, yarns or monofilaments on a loom, like a heavy industrial fabric. A non-woven geotextile is a needle-punched fabric of staple fibres, sometimes heat-treated on one side, with no yarn structure at all.
How they behave differently
- Strength and elongation: wovens reach high strength, often tens of kilonewtons per metre, at elongation of roughly 10 to 25 per cent. Non-wovens are weaker for their weight but stretch 50 per cent or more before breaking, which lets them deform around stones without tearing.
- Water flow: non-wovens have high permittivity and pass water freely in all directions, and thick grades carry water in their own plane. Wovens, especially slit-film tapes, have lower flow and a more regular opening size.
- Filtration: the random pore structure of a non-woven holds fine soil while passing water, which is why they are specified for drains and behind walls. Wovens filter less well unless made as monofilament fabrics designed for it.
- Puncture and protection: the thickness and elongation of heavy non-wovens make them the standard cushion layer over landfill liners. Wovens are thin and do not protect a membrane well.
- Cost: for the same weight, wovens are usually cheaper per square metre and stronger, so they are chosen when strength is the only requirement.
Typical choices by application
Haul roads, working platforms and embankments on soft ground usually use wovens or geogrids, because the job is to carry load. Subsurface drains, French drains, retaining wall backfill and landfill protection layers use needle-punched non-wovens. Road separation on ordinary ground can be either, and the choice often comes down to the sub-grade: a wet, fine sub-grade favours a non-woven for its filtration, while a firm one favours a woven for its strength and price.
What to check on an Indian quotation
Ask whether the plant weaves and needle-punches itself or buys one of the fabrics in. Many Gujarat plants run one process, not both, and a trader may offer both without saying which plant made which. For wovens, ask for the tape or yarn type, since slit-film, fibrillated and multifilament fabrics differ widely in strength and flow. For non-wovens, ask whether the fibre is polyester or polypropylene and whether the fabric is calendered on one side, which raises strength but reduces water flow.
In both cases, ask for test results under ISO 10319 for tensile and ISO 11058 for permeability, and compare them with the design values rather than with each other. A woven that beats a non-woven on strength has not won anything if the design called for filtration.
How we help
We confirm which process each plant actually runs, audit the line, and send sealed samples to an NABL-accredited lab for tensile and permeability against your design values. We inspect before shipment, supervise loading and send a weekly update, with one approved supplier and one backup. If you are unsure which fabric your project calls for, a free 20-minute sourcing review is a good first step.