ISO 6989:1981 Preview
Textile fibres -- Determination of length and length distribution of staple fibres (by measurement of single fibres)
This standard was last reviewed and confirmed in 2015. Therefore this version remains current.
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.
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