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ISO 6989:1981
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ISO 6989:1981 Textile fibres -- Determination of length and length distribution of staple fibres (by measurement of single fibres)
standard by International Organization for Standardization, 05/01/1981
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Specifies three methods for determination - method A: on a straightened fibre on a graduated rule, under a light tension applied with the aid of forceps and grease; - method B: measurement, using an opisometer, of the length of the image of fibre enlarged by projection on a screen; - method C: by use of a semi-mechanical device. - Intended to replace two existing International Standard, ISO 270 and ISO 1822.