U.S. imports of Synthetic Staple Fibers of Acrylic or Modacrylic, Unprocessed (SITC 26653) totaled $2.7M in August 2026, imported from 16 countries.
Importers of Synthetic Staple Fibers of Acrylic or Modacrylic, Unprocessed paid $429K in duties in August 2026, an average duty rate of 15.75% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Synthetic Staple Fibers of Acrylic or Modacrylic, Unprocessed imports of $2.7M in August 2026 ran 41% below the year-to-date monthly average of $4.6M.
Last updated: August 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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28 import shipments a month
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.
Basic heading 105 of 239 in section 2
Basic heading 26653 · $2.7M of $3.8B
Imports · August 2026
origin
Turkey and Mexico together supply 94% of it. Turkey pays 16.8% duty; France 0.3%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$2.7MYoY · free account
Exports
$667KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $57.2M of Synthetic Staple Fibers of Acrylic or Modacrylic, Unprocessed and exported $9.9M.
Through August 2026. Source: U.S. Census Bureau.
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