14—Relations between Different Measures of Maturity and Fineness of Cotton

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Abstract
In the caustic soda swelling test for fibre maturity originally developed at the Shirley Institute and largely adopted as British practice, fibres are classed into Normal, Thin-walled, and Dead groups. A quantity termed the maturity ratio may be calculated from the proportions of fibres in these three groups and is directly proportional to the degree of fibre wall thickening. Elsewhere, particularly in the United States, it is common to class fibres into but two categories, known as Mature and Immature. Empirical relations are developed between the two systems of classification and the proportion of Mature fibres in a sample may be transformed into an estimate of the maturity ratio. These relations permit estimates of intrinsic fibre fineness to be made, from American test results, by calculating the fibre weight per inch a cotton would give at an arbitrary standard maturity level.

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