Flat Crush (FCT)
Flat Crush Test measures the resistance of the flutes to a crushing force applied perpendicularto the surface of the board under prescribed conditions
TAPPI-T 808 – Flat crush test of corrugated board (flexible beam method)
The flat crush test (1) is a measure of the resistance of the flutes in corrugated board to a crushing force applied perpendicular to the surface of the board under prescribed conditions. The test is satisfactory for single-faced or single wall (double-faced) corrugated board, but not for double-wall or triple-wall corrugated board or other complex corrugated structures, because of lateral motion of the central facing or facings.