GB/T 35215-2017Standard methods for development of characteristic values of structural wood-based panels (English PDF)

3.1 Structural wood-based panel for

To bear for the purpose, the use of veneer, shavings and other wood, bamboo unit, through the drying, sizing, group blank, pressed into the structure of the plate

Materials, including structural plywood, waffle shavings, OSB, etc.

3.2 Eigenvalues characteristicsvalues

A certain quantile of probability distribution of performance of plywood with structural quality in accordance with the stipulated quality, and assuming that the probability distribution obeys normal distribution. This standard

The criterion is to use the mean value of flexural modulus as its eigenvalue, and all others take the 5% quantile with a 75% confidence level for the corresponding statistical distribution of performance.

4.1

randomly selected according to the production batch of not less than 12 samples, each sample contains 4 sample plates, the test sample should be the same type, grade,

Thickness and composition of the blank group composed of samples, and samples in this batch of products are representative.

4.2

From each sample plate interception bending, tensile, compressive, shear and density performance of a specimen. Specimens should be selected from the sample plate at different locations

Take, and from the edge of the sample is not less than 50mm, Appendix A for each performance test specimen sampling sequence diagram.

5.1 moisture content adjustment

Should be at a temperature of 20 °C ± 2 °C and relative humidity of 65% ± 5% of the environment to achieve a constant mass, constant mass within 48h to

Reduce the water content within ± 0.5% within 3 consecutive times. If the test environment is not consistent with the moisture content of the sample conditioning environment, the sample should always be

Placed in the moisture content adjustment environment until the test.