Fiber saturation range

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The fiber saturation range (also: fiber saturation point ) describes a certain moisture level of wood .

Below the fiber saturation range, moisture is only stored in the cell walls as bound water . If the moisture content is above fiber saturation, wood can only absorb additional moisture in the form of free water in the lumina of its cells , which has only a minor influence on its physical and mechanical properties. However, if the moisture content changes below the fiber saturation, this has a decisive influence on its properties. B. to swell or to shrink .

The fiber saturation range is specific to the type of wood and is between 24% and 32% wood moisture in most woods . Since the wood moisture describes the ratio of the water mass in the wood to the mass of the kiln-dried wood, the fiber saturation range for light types of wood such as B. balsa wood can be more than 50% moisture content.