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SITCSection 2
U.S. imports of synthetic staple fibers of acrylic or modacrylic, unprocessed (SITC 26653) totaled $5.6M in April 2026, traded with 14 countries.
Importers of Synthetic Staple Fibers of Acrylic or Modacrylic, Unprocessed paid $790K in duties in April 2026 — an effective duty rate of 14% on $5.6M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataAcrylic and modacrylic staple fibers in unprocessed form are the primary raw material for knitwear, fleece fabrics, and flame-retardant textiles, with modacrylic variants specifically valued for their inherent fire-resistance properties. The modacrylic sub-type is chemically distinct — containing between 35% and 85% acrylonitrile — and that compositional threshold is the key classification boundary separating it from standard acrylic fiber. Global production is concentrated in a relatively small number of chemical fiber producers, so supply disruptions can have outsized effects on downstream knitwear manufacturers.
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Modacrylic fiber contains between 35% and 85% acrylonitrile by weight, whereas standard acrylic fiber contains 85% or more. This compositional difference is the defining boundary; importers should obtain fiber composition certificates from suppliers to support correct classification.
Modacrylic's co-polymer structure — incorporating halogenated monomers — gives it inherent, non-topical flame resistance that survives repeated laundering. This makes it the preferred fiber for protective workwear, children's sleepwear, and upholstery applications where flammability standards must be met without chemical finishing.
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Monthly import values over time