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SITCSection 6
U.S. imports of uncoated semichemical fluting paper (corrugating medium), in rolls or sheets (SITC 64151) totaled $22.4M in April 2026, traded with 13 countries.
Importers of Uncoated Semichemical Fluting Paper (Corrugating Medium), in Rolls or Sheets paid $257K in duties in April 2026 — an effective duty rate of 10% on $2.6M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataSemichemical fluting paper — also called corrugating medium — is the fluted inner layer of corrugated board, produced by a semichemical pulping process that retains more hemicellulose than full chemical pulping, giving the sheet the stiffness and compressibility needed to form and hold a flute profile. Its performance is measured by the Concora Medium Test (CMT), which quantifies flat crush resistance and is a standard specification in corrugated board procurement contracts. Demand for this grade tracks directly with corrugated packaging output, making it sensitive to e-commerce volumes, consumer goods production, and agricultural shipping seasons.
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The Concora Medium Test (CMT) measures the flat crush resistance of a fluted paper sample and is the primary quality benchmark for corrugating medium. A higher CMT value indicates better stacking strength in the finished corrugated box. Buyers typically specify minimum CMT values in purchase contracts, and importers should ensure mill test reports confirm compliance with the agreed specification.
Semichemical pulping — typically the neutral sulfite semichemical (NSSC) process — partially delignifies wood chips while retaining hemicellulose, producing a stiff, dense sheet well-suited to flute formation. This process distinguishes semichemical fluting from recycled-fiber medium (OCC-based) and from fully chemical kraft grades, and is a key criterion for classification under SITC 64151.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| CANADA | $19.9M | $10.5M | -$9.4M |
| MEXICO | -- | $12.8M | +$12.8M |
| COSTA RICA | -- | $2.7M | +$2.7M |
| FINLAND | $1.1M | -- | -$1.1M |
| EL SALVADOR | -- | $1.1M | +$1.1M |
Monthly import values over time