U.S. imports of Uncoated Semichemical Fluting Paper (Corrugating Medium), in Rolls or Sheets (SITC 64151) totaled $31.4M in August 2026, imported from 16 countries.
Importers of Uncoated Semichemical Fluting Paper (Corrugating Medium), in Rolls or Sheets paid $658K in duties in August 2026, an average duty rate of 2.09% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Uncoated Semichemical Fluting Paper (Corrugating Medium), in Rolls or Sheets imports of $31.4M in August 2026 ran 32% above the year-to-date monthly average of $23.9M.
Last updated: August 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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1.9K import shipments a month
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.
Basic heading 185 of 766 in section 6
Basic heading 64151 · $31.4M of $27.0B
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Imports · August 2026
origin
Canada and Finland together supply 85% of it. Israel pays 12.5% duty; Canada 0.0%.
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
$31.4MYoY · free account
Exports
$32.3MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $251.5M of Uncoated Semichemical Fluting Paper (Corrugating Medium), in Rolls or Sheets and exported $421.5M.
Through August 2026. Source: U.S. Census Bureau.