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leno weave fiberglass cloth
Leno weave fiberglass cloth is a woven fabric in which adjacent warp yarns are twisted around each other between picks of filling yarn, locking the structure into place. This interlocking geometry prevents yarn displacement and holds a stable open mesh even under handling and resin flow. The fabric is manufactured from continuous E-glass filaments and is supplied in roll form with mesh openings typically ranging from 2 mm to 25 mm, areal weights from 60 g/m² to 300 g/m², and thicknesses from 0.15 mm to 0.60 mm. Tensile strength ranges from 120 MPa to 260 MPa depending on construction. Leno cloth is used where resin transmission, air release, or dimensional locking is required, and it is compatible with epoxy, polyester, vinylester, and phenolic systems. Roll widths from 1000 mm to 2000 mm and roll lengths from 50 m to 200 m are available.
Two warp systems are used. The ground warp runs straight, while the crossing warp passes alternately over and under the ground warp and the filling yarn. The result is a locked mesh with no yarn slippage in either direction.
Mesh aperture is controlled by the crossing frequency and warp spacing. Standard apertures are 2 × 2 mm, 5 × 5 mm, 10 × 10 mm, and 25 × 25 mm. Custom apertures can be produced to match resin flow requirements.
Because the warp yarns are mechanically interlocked, the mesh resists distortion during cutting, handling, and lay-up. This removes the need for temporary binders or edge sealing in most processes.
Specification Range
Where Leno Construction Is Specified
Processing Notes
Frequently Asked Questions
Plain weave uses a one-over-one interlacement where warp and weft yarns cross at right angles. Leno weave adds a second warp system that twists around the ground warp, mechanically locking the structure. This gives leno cloth higher resistance to yarn displacement and shape distortion, but lower tensile strength per unit weight because the yarns follow a crimped path. Plain weave is used where strength is the primary requirement; leno weave is used where stability and openness are the primary requirements.
Leno cloth is generally not used as the primary structural layer because its open mesh provides lower fiber volume fraction and lower load-bearing capacity than closed fabrics. It is typically used as a surface veil, flow medium, or carrier layer in combination with structural fabrics such as plain or twill weave. In some applications, multiple layers of fine-mesh leno are stacked to build thickness, but the mechanical properties remain below those of equivalent-weight closed fabrics.
For vacuum infusion flow media, a mesh aperture of 5 mm to 10 mm is typical. Smaller apertures restrict resin flow and increase fill time. Larger apertures allow faster flow but may cause resin-rich areas or print-through on the surface. The selection should be based on resin viscosity, part size, and surface finish requirements. For large parts with low-viscosity resin, 10 mm aperture is a common starting point.
Yes. Leno cloth is supplied with silane sizing compatible with phenolic, epoxy, and vinylester systems. For phenolic resins, which release water during cure, the open mesh allows volatiles to escape more easily than closed fabrics, reducing void formation. For high-temperature applications above 400°C, confirm that the sizing and any binder used in the leno construction are rated for the service temperature.
Each shipment includes a certificate of analysis covering areal weight, mesh aperture, thickness, sizing type, and roll length. Lot numbers are recorded for traceability. Additional test data including tensile strength and resin compatibility statements can be provided on request for qualified accounts.
