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This heading applies to thrown silk, i.e., yarns obtained by twisting (either singly or two or more together) the raw silk threads of heading 50.02.
They are, however, excluded if put up for retail sale (heading 50.06) or if within the definition of twine, cordage, etc. (heading 56.07) (see Parts (Ⅰ) (B) (2) and (3) of the General Explanatory Note to Section XI).
The yarns of this heading differ from the yarns spun from silk waste classified in the following heading in that they are formed of continuous fibres. There are many varieties, including :(1) Single yarns (sometimes known as poils), obtained by twisting a single raw silk thread. Hard-twisted yarns of this type are often called crepe poils, mousselines or chiffon twist. (2) Tram yarns, obtained by loosely twisting two or more unthrown raw silk threads; these are used as weft yarns. (3) "Crepe twist", generally a hard-twisted tram. (4) Organzine yarns, obtained from two or more raw silk threads which have been well twisted in the single by doubling them with reverse twist. Grenadine yarn is a hard-twisted organzine. These are used mainly as warp yarns. All these yarns may be discharged or finished.
The heading excludes imitation catgut of silk, of heading 56.04.
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