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The flat crush test (FCT) explained

Flat crush tests (FCT) are performed to EN ISO 3035 or TAPPI T 825. In the flat crush test, a single-flute corrugated-board specimen is loaded perpendicular to its surface. The resistance this corrugated board presents to the force provides an indication of its behavior during processing and in use. It is important that forces are applied exactly perpendicular to the specimen during these tests.

Characteristic curve

  • Depending on individual flute heights, the highest flutes collapse first, then the middle ones, followed by the remaining flutes at the end of the test.
  • The crush energy and curve provide indications of the level of any pre-damage which may be present as the curve is fundamentally different in the event of pre-damage to the board.
  • If the corrugated board has been pre-damaged, the curve is fundamentally different. The crush energy and curve provide indications of the level of any pre-damage.
(FCT) flat crush test

Flat crush test (FCT) with Zwick

  • Precision-guided compression platens ensure extremely high lateral stiffness, guaranteeing reproducible test values.
  • The compression platens are suitable for the ring crush test (RCT), the flat crush test (FCT), the edge crush test (ECT) and the corrugating medium test (CMT).
  • Modern miniature flutes tend to collapse only under forces greater than 10kN, necessitating extremely high lateral stiffness in the compression platens. Suitable platens are available from Zwick for these applications also.
  • To ensure accurate specimen preparation a circular cutter is used.


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