U.S. imports of Synthetic Staple Fibers, Not Processed for Spinning (Other) (HS 550390) totaled $7.5M in August 2026, imported from 20 countries.
Importers of Synthetic Staple Fibers, Not Processed for Spinning (Other) paid $811K in duties in August 2026, an average duty rate of 10.87% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Synthetic Staple Fibers, Not Processed for Spinning (Other) imports of $7.5M in August 2026 ran 47% above the year-to-date monthly average of $5.1M.
Last updated: August 2026 dataCovering synthetic staple fibers that fall outside polyester, acrylic/modacrylic, and polypropylene — including specialty types such as vinyon — this residual heading captures niche engineering and performance fibers used in filtration, specialty nonwovens, and technical textiles. The US schedule separates vinyon fibers (5503901000) from all other non-vinyon types (5503909000), with a legacy basket line (5503900000) also present. South Korea and Germany are the leading US suppliers, reflecting both commodity and high-specification fiber sourcing.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
94 import shipments a month
Vinyon is a synthetic fiber composed of at least 85% polyvinyl chloride (PVC) by weight. Its low softening point makes it useful as a thermal binder in nonwoven fabrics. The US schedule carves it out into its own line (5503901000) separate from other non-polyester, non-acrylic, non-polypropylene synthetic staple fibers (5503909000), so importers must confirm the fiber's polymer composition to select the correct 10-digit code.
If the fiber cannot be classified as polyester, acrylic/modacrylic, polypropylene, nylon/polyamide, or vinyon, it falls into the NESOI (not elsewhere specified or included) basket under 5503909000. Importers should obtain a detailed polymer composition certificate from the manufacturer and consider requesting a binding ruling from CBP if the fiber's classification is genuinely ambiguous, particularly for novel bio-based or multi-component constructions.
Subheading 2 of 6 in heading 5503
Subheading 550390 · $7.5M of $54.5M
Trade Directory
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ImportsExports
Imports
$7.5MYoY · free account
Exports
$2.6MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $55.1M of Synthetic Staple Fibers, Not Processed for Spinning (Other) and exported $27.8M.
Through August 2026. Source: U.S. Census Bureau.
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 |
|---|---|---|---|---|---|
| 5503909000 | Syn Stp Fib not Card, Cmb or Prsd Spng: not Vinyon | $7.4M | 10.66% | 100.00% | $785K |
| 5503901000 | Syn Stp Fib not Card, Cmb or Prsd Spng: of Vinyon | $99K | 26.51% | 99.23% | $26K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 5503900000 | Syn Stp Fib not Card, Cmb or Prsd Spng: NESOI | $2.6M |
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 · August 2026
origin
Germany and South Korea together supply 77% of it.
customs district
destination
entry
rate provision · imports
0.0100% enters free of duty; duty collected equals 10.87% of imports for consumption.