ISO 2

For two-letter country codes, see ISO 3166-1 alpha-2.

ISO 2 is an international standard for direction of twist designation for yarns, complex yarns, slivers, slubbings, rovings, cordage, and related products.[1] The standard uses capital letters S and Z to indicate the direction of twist.[2] The convention of using these two letters to unambiguously designate twist direction was already used in the cordage industry by 1957.[3]

References

  1. ^ International Organization for Standardization (1973), ISO 2:1973 Textiles — Designation of the direction of twist in yarns and related products, http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=3563 
  2. ^ The International Bureau For The Standardisation of Man-Made Fibres (BISFA) (2006), Terminology of man-made fibres, p. 46, http://www.bisfa.org/booklets/Terminology_2006.pdf 
  3. ^ Himmelfarb, David (1957). The Technology of Cordage Fibres and Rope. London: Leonard Hill. p. 116. 

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