Fiber tenacity, elongation, length, fineness, and color were measured for 5 Gossypium barbadense L. and 37 G. hirsutum L. fiber samples. These samples were spun into 12- and 27-tex yarns on a ring system and into 27-tex yarns on an open-end system; yarn tenacity was determined. Fiber tenacity and length were positively correlated with yarn tenacity. No correlations of fiber fineness with tenacity of 27-tex yarns were detected. A substantial portion of the variation in 27-tex yarn tenacity was attributable to variations in fiber tenacity and length.

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Five cotton samples were tested for 3.2 mm-gauge tenacity and elongation five times daily as relative humidities (RH) were cycled within the limits of 70 and 48%. Tenacity and elongation responded almost instantaneously to changes in RH. In a controlled laboratory maintained at a standard atmosphere of 70 ± 2°F and 65 ± 2% RH, up to 4% range in tenacity and in elongation may be expected due to the oscillating RH alone.