This standard specifies the methods of test for evaluating the physical and mechanical properties of plywood, including moisture content, density, glue shear strength, water resistance, and static bending strength.
Methods of test for plywood
Quick Reference Values
Moisture content drying temperature103 ± 2°C
Conditioning temperature27 ± 2°C
Conditioning relative humidity65 ± 5%
Accuracy for thickness measurement0.01 mm
Accuracy for length and width measurement0.1 mm
Key Formulas
Moisture Content (%) = ((M1 - M0) / M0) x 100 — where M1 is initial mass, M0 is oven-dry mass
Density = Mass / Volume
Modulus of Rupture (MOR) = (3 * Pmax * L) / (2 * b * d^2) — for static bending strength
Practical Notes
Ensure specimens are properly conditioned to constant mass at standard temperature and humidity before testing, as wood properties are highly sensitive to moisture variations.
Grain direction must be clearly marked before cutting test pieces. Tests like static bending and tension must be evaluated both parallel and perpendicular to the grain direction of the face veneer.
For marine and exterior grade plywood tests, ensure the boiling water bath maintains a continuous rolling boil for the entire specified duration without dropping in temperature.