ASYCUDA
  Online Harmonised Commodities Code database

You can enter a keyword or the first few digits from the commodity code, e.g. enter "book" to view commodities with the word book in the description, or enter"490" to view commodities whose code begins with 490.  Commodity codes can be as general as 1 digit or as specific as 6.

Commodities with Heading Code: 5506

Commodity Code Description
Section 11 : Textiles and textiles articles
   Chapter 55 : Man-made staple fibres
     Heading 5506 : Synthetic staple fibres, carded, combed or processed for spinning
550610 Synthetic staple fibres, of nylon or other polyamides, carded, etc
550620 Synthetic staple fibres, of polyesters, carded, etc
550630 Acrylic or modacrylic synthetic staple fibres, carded, etc
550690 Synthetic staple fibres, nes, carded, etc