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HSChapter 55
U.S. imports of synthetic staple fibers, not processed for spinning (other) (HS 550390) totaled $4.2M in April 2026, traded with 15 countries.
Importers of Synthetic Staple Fibers, Not Processed for Spinning (Other) paid $501K in duties in April 2026 — an effective duty rate of 12% on $4.2M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 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.
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.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 5503909000 | SYN STP FIB NOT CARD, CMB OR PRSD SPNG: NOT VINYON | $4.2M | 11.91% | $501K |
| 5503901000 | SYN STP FIB NOT CARD, CMB OR PRSD SPNG: OF VINYON | $357 | 10.08% | $36 |
SYN STP FIB NOT CARD, CMB OR PRSD SPNG: NOT VINYON
SYN STP FIB NOT CARD, CMB OR PRSD SPNG: OF VINYON
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 5503900000 | SYN STP FIB NOT CARD, CMB OR PRSD SPNG: NESOI | $2.5M |
SYN STP FIB NOT CARD, CMB OR PRSD SPNG: NESOI
728.4K kg
SYN STP FIB NT CRD, CMB OR PRSD SPNG, OF POLYESTER
HS 550320
ARTIF STP FIB NT CRD, CMB OR PRSD SPNG, VIS RAYON
HS 550410
YRN N SW TH MM ST FIB RT SL SYN STP FIB >=85% S FB
HS 551110
STPL FIB ARAMIDS NOT CARD/COMBD/PRCSD FOR SPINNING
HS 550311
SYN STP FIB NT CRD, CMB OR PRSD SPNG, ACRY/MODACRY
HS 550330
ART STP FIB NOT CRD, CMB OR PRSD SPNG, OTH VIS RYN
HS 550490
| Country | Imports | Exports | Balance |
|---|---|---|---|
| KOREA, SOUTH | $1.7M | -- | -$1.7M |
| CANADA | -- | $1.5M | +$1.5M |
| JAPAN | $941K | $3K | -$937K |
| TAIWAN | $739K | -- | -$739K |
| GERMANY | $507K | $160K | -$347K |
| State | Imports | Exports | Balance |
|---|---|---|---|
| Georgia | $1.2M | $2.3M | +$1.1M |
| North Carolina | $1.2M | $71K | -$1.1M |
| California | $934K | $39K | -$896K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| CHARLESTON, SC | $1.7M | -- | -$1.7M |
| SAVANNAH, GA | $1.1M | $216K | -$922K |
| ALEXANDRIA BAY, NY | -- | $1.1M | +$1.1M |