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Figure 9. In stress-free lumber the prongs will remain straight after the sample has cooled. Be careful: you can condition the lumber for too long (“over-condition” the wood) and reverse the stresses again, in which case the prongs will move outwards. This is called reverse casehardening. Reverse casehardening cannot be fixed. If you’re interested in selling lumber to a European market, note that European markets make use of a standard designated as ENV 14464 (a “slicing test”) to determine the relief of drying stresses. See Dried Timber – How to specify correctly. USING SAMPLE BOARD WEIGHTS AS AN ALTERNATIVE TO PRONG TESTS. If you choose not to use a microwave to hasten readings of prong tests, you have another option. Some mills weigh their sample boards before conditioning and continue to monitor these weights until the moisture contents are approximately 11⁄2% higher than they started out. If you choose to try this, I recommend that you continue using prong tests as well until you are comfortable with this procedure. 57PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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