During the period from green to fiber saturation point (F.S.P.), the velocity of stress wave increased slowly, but it increased sharply when the moisture content decreased below F.S.

• 槟榔干材由生材状态乾燥至纤维饱和点时，波速呈缓慢加快，而含水率在纤维饱和点以下时，波速呈现急速之上升。