适用于任何纺纱系统生产的任何纤维或纤维混合物的单纱和折叠纱。不建议用于测试长丝纱、玻璃纱、更复杂的结构，如电缆纱或绳索。不适用于直径大到可以防止绞纱卷绕成两层的纱线。-取代第一版（ISO 6939:1982），并构成其次要修订版。

Applicable to spun single and folded yarns of any fibre or mixture of fibres manufactured by any spinning systems. Not recommended for testing filament yarns, glass yarns, more complex structures such as cabled yarns or cords. Not applicable to those yarns having a diameter so great as to prevent the winding of the skein in two even layers. - Replaces the first edition (ISO 6939:1982) and constitutes its minor revision.