Preconditioning. Preconditioning of plywood or particleboard panels for air chamber tests shall be initiated as soon as practicable but not in excess of 30 days after the plywood or particleboard is produced or surface-finished, whichever is later, using randomly selected panels.
If preconditioning is to be initiated more than two days after the plywood or particleboard is produced or surface-finished, whichever is later, the panels must be dead-stacked or air-tight wrapped until preconditioning is initiated.
Panels selected for testing in the air chamber shall not be taken from the top or bottom of the stack.
Testing. Testing must be conducted in accordance with the Standard Test Method for Determining Formaldehyde Levels from Wood Products Under Defined Test Conditions Using a Large Chamber, ASTM E 1333-96, with the following exceptions:
The chamber shall be operated indoors.
Plywood and particleboard panels shall be individually tested in accordance with the following loading ratios:
Plywood—0.29 Ft2/Ft3, and
Particleboard—0.13 Ft2/Ft3.
Temperature to be maintained inside the chamber shall be 77° plus or minus 2 °F.
The test concentration (C) shall be standardized to a level (CO) at a temperature (tO) of 77 °F and 50% relative humidity (HO) by the following formula:
The air chamber shall be inspected and recalibrated at least annually to insure its proper operation under test conditions.
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