Synthetic filament yarn, single, containing by weight 85 % or more of acrylonitrile, in the form of a wick containing 1 000 continuous filaments or more but not more than 25 000 continuous filaments, of a weight per metre of 0,12 g or more but not exceeding 3,75 g and of a length of 100 m or more, for the manufacture of carbon-fibre yarn
