by U.S. Dept. of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station in Ogden, Utah .
Written in English
|Statement||Glenn L. Gernert, Arland Hofstrand, and David P. Lowery.|
|Series||Research note INT -- 276.|
|Contributions||Hofstrand, Arland., Lowery, David P., Intermountain Forest and Range Experiment Station (Ogden, Utah)|
|The Physical Object|
|Pagination||7 p. :|
Comparison of percent shrinkage and specific gravity for three types of western white pine wood. Ogden, Utah: U.S. Dept. of Agriculture, Forest Service, . Western White Pine: Pinus monticola: Wagner has compiled species’ average specific gravity (SG) values (wood volume at 12% moisture content (MC) As an example, let’s say we have a published SG value of referenced to 0% MC with a shrinkage ratio of % of volume per percent MC. We want to convert to an SG value referenced to Western Woods White Oak Yellow Cedar Yellow Poplar Specific Gravities For Non-North American Wood Species Species Combination Specific Gravity, G Austrian Spruce – Austria & The Czech Republic Douglas Fir/European Larch – Austria, The Czech Republic & Bavaria Montane Pine – South Africa Pricing/Availability: Western White Pine is widely harvested for construction lumber and is sometimes sold interchangeably with Sugar Pine. Prices should be moderate to high for a domestic softwood. Sustainability: This wood species is not listed in the CITES Appendices, and is reported by the IUCN as being a species of least concern.
Typical wood shrinkage from green to ovendry moisture content is typical % in radial grain direction and % in tangential grain direction. Volumetric shrinkage is typical %. Longitudinal shrinkage parallel to the grain is generally quite small. Typical values from green to ovendry wood are %. The shrinkage of wood is affected by a number of variables. In general, greater shrinkage is associated with greater wood density. The size and shape of the wood may also affect shrinkage, as may the temperature and rate of drying for some species. Longitudinal shrinkage of wood (shrinkage parallel to the grain) is quite small. * Legal disclaimer: Wagner has compiled species’ average specific gravity (SG) values (wood volume at 12% moisture content (MC) and oven-dry weight) from industry-accepted 3rd-party sources (USDA Forest Products Laboratory as an example) and provides this list for free with no implied an SG value listed in Wagner Meters’ manuals or website has been verified by Wagner, this. max for any basic specific gravity can be estimated from (4–3) where the specific gravity of wood cell walls is taken as Maximum possible moisture content varies from % at G b = to 44% at G b = Maximum possible mois-ture content is seldom attained in living trees. The moisture content at which wood will sink in water can.
In book: Wood handbook--Wood as an engineering material; sand 68 50 Pine, western white 62 Hickory, Density of wood as a function of specific gravity and moisture content (SI). All birches shrink considerably during drying. Yellow birch must be seasoned carefully to prevent checking and warping. Eleven to 15 days are required to dry 1-inch lumber from the green condition to 6 percent moisture content. Because yellow and sweet birch are difficult to glue, special veneer and. specific gravity. Radial Tangential Longitudinal Fiber direction Figure 4–1. Three principal axes of wood with respect to grain direction and growth rings. Table 4–1. Elastic ratios for various species at approximately 12% moisture contenta Species ET/EL ER/EL GLR/EL GLT/EL GRT/EL Hardwoods Ash, white —. Column 3, specific gravity 19 Columns4and5, weight per cubic foot-. 19 6, 7, and 8, shriiûfage.- 20 Column 9, bending strength 21 Col compressive strength (end- wise) 22 Col stiffness 22 12, hardness. 22 Col shock resistance 22 Percentage estimated probable variation. 23 Appendix 1 23 ofstructural material