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This heading covers single yarns produced by spinning the noil or other silk waste of heading 50.03; it also covers multiple (folded) yarns produced from these single yarns.
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).(A) Yarn spun from silk waste other than noil silk.
Yarn spun from silk waste other than noil silk, unlike the silk yarn of the preceding heading, is formed of discontinuous fibres. These fibres, which may be up to 20 cm long, lie parallel in the yarn, giving it a smooth, silky and fairly glossy surface; these latter characteristics distinguish it from yarn spun from noil silk. (B) Yarn spun from noil silk.
Noil silk yarns are of much poorer quality than other silk waste yarns; they are composed of fibres of varying lengths, usually less than 5 cm; since these fibres have simply been carded but not combed, they are usually still somewhat tangled and form small knots atintervals. Noil silk yarn accordingly lacks the strength and regularity of yarn spun from other silk waste and has a rather dull surface. The heading includes yarn which has been processed as described in Part (Ⅰ) (B) (1) of the General Explanatory Note to Section XI.
The heading excludes imitation catgut of silk, of heading 56.04.
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