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BASIC DENSITY AND MOISTURE CONTENT OF PULPWOOD
Wood, Density, Moisture content, Weight, Chips, Bulk density, Volume, Logs

Product Details
This method describes the measurement of the basic density (bone-dry weight per
unit of maximum volume) of pulpwood in the form of chips or disks from the cross
section of logs. The method also gives procedures for determining the moisture
content of wood in either form.
For moisture content of wood in the form of sawdust see TAPPI T 264
"Preparation of Wood for Chemical Analysis (Including Procedures for
Removal of Extractives and Determination of Moisture Content)." Moisture content is determined by the difference in weight as received and
after drying at 105 ± 3°C. Volume is determined by the amount of water displaced by the test specimen of
wood. Because wood swells or shrinks, respectively, with absorption or loss of
water, it is necessary to express the density at a specified moisture content
and corresponding volume. The usual conditions are the minimum (oven-dry or
moisture-free) weight and the maximum (green) or the minimum (oven-dry or
moisture-free) volume. For most purposes, the maximum volume basis is
sufficient. In the present method the specimen is considered to have swollen to
its maximum volume when its moisture content exceeds the "fiber-saturation
point," which lies between 18 and 26% by weight (wet basis) for most
species. Procedures for obtaining the volume, both green and oven-dry, are
described in this method. Many wood technologists consider the density of wood is best expressed only
on the basis of oven-dry weight and maximum volume, because at moisture contents
above the fiber-saturation point the maximum volume is essentially constant.
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