Customs Tariff 

Chapter 55

Man-Made Staple Fibres

1. Headings 5501 and 5502 apply only to man-made filament tow, consisting of parallel filaments of a uniform length equal to the length of the tow, meeting the following specifications:
(a) Length of tow exceeding 2 m;
(b) Twist less than 5 turns per metre;
(c) Measuring per filament less than 67 decitex;
(d) Synthetic filament tow only; the tow must be drawn, that is to say, be incapable of being stretched by more than 100% of its length;
(e) Total measurement of tow more than 20,000 decitex.
Tow of a length not exceeding 2 m is to be classified in heading 5503 or 5504.