U.S. imports of Synthetic Staple Fiber Yarn Mixed with Other Fibers (NESOI), Not for Retail Sale (Under 85% Synthetic Staple Fibers) (HS 550999) totaled $252K in September 2026, imported from 13 countries.
Importers of Synthetic Staple Fiber Yarn Mixed with Other Fibers (NESOI), Not for Retail Sale (Under 85% Synthetic Staple Fibers) paid $36K in duties in September 2026, an average duty rate of 14.24% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: September 2026 dataResidual in structure, this heading captures synthetic staple fiber yarns whose secondary fiber blend does not qualify as wool, fine animal hair, or cotton — covering combinations such as synthetic-linen, synthetic-silk, or multi-fiber constructions not elsewhere specified. The 'NESOI' designation makes precise fiber documentation especially important, since CBP may scrutinize whether a shipment truly falls outside the more specific headings. Canada and Turkey lead US supply, with the United Kingdom, China, and France also contributing, reflecting a diverse sourcing base for specialty blended yarns. Three 10-digit lines (5509990000, 5509992000, 5509996000) subdivide this heading by construction and fiber combination.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
7 import shipments a month
A yarn qualifies as NESOI here when its secondary fiber is neither wool/fine animal hair nor cotton, and the synthetic content is below 85% by weight. Common misclassification risks include yarns with a cotton component that is borderline in weight — if cotton is the primary non-synthetic fiber, the correct heading may be 550992. Detailed fiber analysis reports are the best defense against reclassification.
The three lines — 5509990000, 5509992000, and 5509996000 — reflect differences in yarn construction and fiber combination. Importers should work with the manufacturer to confirm both the fiber blend percentages and whether the yarn is single, multiple, or cabled, as these structural attributes drive the correct 10-digit selection and affect the applicable duty rate.
ImportsExports
Imports
$252KYoY · free account
Exports
—YoY · free account
12-mo low · imports
Low · free accountOver the twelve months to September 2026, the U.S. imported $3.6M of Synthetic Staple Fiber Yarn Mixed with Other Fibers (NESOI), Not for Retail Sale (Under 85% Synthetic Staple Fibers).
Fewer 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 · exports 9 of 12 months reported. Source: U.S. Census Bureau.
Subheading 7 of 18 in heading 5509
Subheading 550999 · $252K of $10.0M
Trade Directory
List your company under HS 550999 — Synthetic Staple Fiber Yarn Mixed with Other Fibers (NESOI), 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 | Duty Collected |
|---|---|---|---|---|---|
| 5509996000 | Yrn N Swg Thd Syt St Fb N Rtl Sale Other Yrn NESOI | $332K | 2.31% | 8.94% | $8K |
| 5509992000 | Yrn N Swg Th Sy St Fb N Rt Sl Ot Y Ot M Art F S Yn | $22K | 45.99% | 100.00% | $10K |
| 5509994000 | Yrn of Syn Stp Fib Nt for Sale Mixed W/Art Fib M/C | — | -- | -- | -- |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 5509990000 | Yrn N Sw Th Syn Stp Fib N Rt Sl Ot Yrns Oth-NESOI | $17K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Imports · September 2026
origin
Canada and China together supply 98% of it. China pays 50.6% duty; Canada 0.0%.
customs district
destination
entry
rate provision · imports
71.9% enters free of duty; duty collected equals 14.24% of imports for consumption.