I didnt say that was what compression set was. I said (in question format) that it was my understanding that reduced reactiveness to RH swings was one consequence of compression set. In any case, a controlled compression set is certainly quite doable. Cheers RicB Why would forcing a controlled 25% compression set (even if it were possible) reduce the tendency for the board to expand and contract with humidity changes? That's not what compression set is. David Love
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