Characteristic strengths and stiffness values are derived from test and are an estimate of the 5th
percentile strength and average stiffness of the population from which the reference sample is taken.
Structural plywood characteristic strength and stiffness values are typically allocated via the F-grade
classification system, as displayed in TABLE 5.1. This Table is a reprint of TABLE 5.1 from AS1720.1-1997
Timber Structures Code. These values must be modified in accordance with the in service factors in
Structural Plywood – Characteristic Properties for F-Grades
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