ISO 1136:2015规定了一种测定羊毛纤维平均直径的方法，该方法使用一种能使气流通过纤维束的装置。 本国际标准适用于均匀、开放状态下分散的干净、未消光的羊毛纤维。它提供了一种特别适用于精梳棉条的方法。试样的二氯甲烷可萃取物质含量不得超过1.0%。适用于用有机溶剂清洗后的油精梳棉条。 本国际标准中所述的方法对羊绒酚、明显有髓的羊毛（见附录D）和染色严重的羊毛不太准确。

ISO 1136:2015 specifies a method for the determination of the mean diameter of wool fibres, using an apparatus which passes a current of air through a bundle of fibres. This International Standard is applicable to clean, unmedullated wool fibres dispersed in a uniform, open state. It provides a method particularly suitable for combed slivers. The dichloromethane extractable matter content of the specimen must not exceed 1,0 %. It is applicable to oil-combed slivers after cleaning with an organic solvent. The method described in this International Standard is less accurate for lambswool and for wool which is appreciably medullated (see Annex D) and heavily dyed wool.