Unidirectional / Multiaxials

Aramid unidirectional fabrics are composed of fibres oriented in only one direction, and therefore work in only one direction. They differ in their grammage, corresponding to the specific weight of a square metre of that particular fabric, in the number of filaments that make up the fibres of the fabric, and in the nature of the binding thread in the warp, which can vary between polyester, glue, glass fibre and cotton (excluding pre-impregnated UDs, which have no binding thread in the warp). In multiaxial fabrics, the fibres are arranged in parallel layers, oriented in the various directions and then stitched with thin filaments to hold them together. These fabrics are available in both simple double-oriented (biaxial) and more complex (quadriaxial) structures.