... F288 covers three types of drawn pure and thoriated tungsten wire suitable for fabrication into parts for electron tubes, lamps, and ... , kinks, curls, and as free of dents, swaging marks, scratches, die marks, laps, seams, splits, slivers, inclusions, bumps, pits, grooves, ... a clean finish, free of graphite, grease, oil, and lubricants. Wire for hooks, supports, springs, anchors, and mesh shall have a ...