Coated lightweight fabric, in particular for a spinnaker

A fabric for lightweight nautical sails for sailboats and other surface vessels, the fabric comprising two surfaces, is formed of continuous polyester warp and weft yarns and is coated on one or both of its two surfaces with a crosslinked polymer, wherein:

• the polyester is poly(ethylene terephthalate) (PET);
• the PET has a tenacity greater than or equal to 6 cN/dtex-;
• the fabric has a density of between 20 and 50 threads/cm, in terms of warp and weft density;
• the polymer is a crosslinked polyurethane (PU) that is polyether-, polyester-, or polycarbonate based;
• and
• the PU is derived from the crosslinking (1) of a single-component polyurethane elastomer having a modulus at 100% elongation of between 6 and 15 MPa, according to the standard DIN 53504, used in implementation in solvent phase;
• (2) by a crosslinking agent, based on a proportion of dry crosslinking agent relative to the dry elastomer of between 40% and 75% by weight;
• and
• the coated fabric has an elongation in the bias direction under 20 lbs of between 10 and 30 hundredths of an inch, measured on test specimens measuring 76 2 mm in width and 300 mm in length and according to the standard NF EN ISO 13934-1.