ISO 2:1973 Preview
Textiles -- Designation of the direction of twist in yarns and related products
This standard was last reviewed and confirmed in 2016. Therefore this version remains current.
Applicable to yarn intermediates such as slivers, slubbings or rovings; to single yarns, plied yarns, cabled yarns; and to threads, twine, cordage and rope. The direction of twist in yarns, slivers, slubbings and rovings is indicated by the capital letters S and Z. The directions of twist are described in two figures. Designation of complex yarns and related products is explained.