Harmonized System
Blending synthetic staple fibers with wool or fine animal hair at less than 85% synthetic content by weight places these yarns in a niche classification that reflects both the premium fiber input and the industrial supply channel — not put up for retail sale. The wool or fine animal hair component typically drives end-use toward higher-value apparel and suiting fabrics, where the synthetic content adds durability or cost efficiency. Lithuania and Romania are the leading US suppliers under this heading, with Italy also a notable source reflecting European specialty textile manufacturing. A single 10-digit line, 5509910000, covers this heading.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Both countries have established worsted and semi-worsted spinning industries with long traditions of blending synthetic staple fibers with wool. Their mills produce yarn specifications — twist levels, count ranges, and blend ratios — that align with US apparel and suiting fabric manufacturers' requirements, giving them a competitive edge in this niche segment.
Yarns containing fine animal hair (such as cashmere, angora, or alpaca) are not subject to USDA APHIS live-animal restrictions once processed into yarn, but importers should be prepared to substantiate the fiber identity and percentage with mill certificates, as misidentification of fiber type is a common basis for CBP examination and potential reappraisal.
Subheading 17 of 18 in heading 5509
Trade Directory
List your company under HS 550991 — Synthetic Staple Fiber Yarn Mixed with Wool or Fine Animal Hair, Not for Retail Sale (Under 85% Synthetic Staple Fibers), so the companies trading it can find you. Be the first supplier listed.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share |
|---|---|---|---|---|
| 5509910000 | Yrn N Swg Th Syn Stp Fb N Rtl Sl Oth Yrn Mx Wl/Fah | — | -- | -- |
Imports
Imports
—YoY · free account
Low of 8 reported months · imports
Low · free accountFewer than 6 of the last 12 months reported trade, or the latest month was under $500K; the trend chart is not shown for thin series.
Through September 2026 · imports 8 of 12 months reported. Source: U.S. Census Bureau.
Imports · September 2026
origin
customs district
destination
entry
rate provision · imports
None recorded for this period.