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TAPPI UM 824:2026
Flexural Stiffness of Corrugated Board
This method is used to measure the bending resistance of corrugated fiberboard in the machine or cross machine direction with a bench-type instrument. Given the lack of a precision statement and the replacement of this approach with more modern equipment (T 836), this method was reclassified as a Useful Method, as the underlying physics is sound and the approach is still used in some segments of the industry. No work has been done to correlate the results of this method with the T 836 method on corrugated board.
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Technical Association of the Pulp and Paper Industry [tappi]