Packaging Science and Testing
Corrugated - Flexural Stiffness

Flexural strength and stiffness are important characteristics relating to the top-to-bottom compression strength of corrugated containers. Flexural stiffness measurements of board when used with the edge crush test can accurately predict the top-to-bottom compression strength of a container. This method measures flexural stiffness of corrugated board using a four-point beam fixture.

A Chatillon^® testing system may be used with a four-point beam fixture to determine flexural strength or corrugated board.

Industry standards for determining the flat crush strength for corrugated board is:
- TAPPI T-820

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