An untwisted bundle of continuous filaments. Commonly used in referring to man-made fibers, particularly carbon and graphite fibers, in the composites industry.
Continuous synthetic fiber filaments (without twist) collected in a loose rope-like form and held together by crimp. Tow is the form before fiber is cut into staple.
An untwisted bundle of continuous filaments (usually carbon) usually designated by a number followed by K, indicating multiplication by 1,000 (for example, 12K tow has 12,000 filaments).