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TAPPI T825
- Flat Crush Test of Corrugated Board (Rigid Support Method)
- standard by Technical Association of the Pulp and Paper Industry,
- Publisher: TAPPI
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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, because of lateral motion of the central facing or facings. In this method the specimen rests on an essentially rigid support and is tested at a constant strain rate. TAPPI T 808 “Flat Crush Test of Corrugated Board” describes a procedure in which the specimen rests on a flexing support and is tested at a constant rate of loading. For corrugated board with rolled or leaning flutes see TAPPI Useful Method 810 “Leaning Flute Free (LFF) Flat Crush of Corrugated Board.”