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    Author(s): William G. Morris
    Date: 1959
    Source: PNW Old Series Research Notes No. 171, p. 1-6
    Publication Series: Scientific Journal (JRNL)
    Station: Pacific Northwest Research Station
    PDF: Download Publication  (360 KB)


    How much does weathering affect accuracy of fuel-moisture indicator stick readings in different sections of Oregon and Washington? If unpainted lumber is exposed to weather for a few years, its color changes and the grain shows as much erosion as if it were sandblasted. According to the Forest Products Laboratory, chemical as well as physical changes produce these effects. Repeated, unequal swelling and shrinking--caused by wetting and drying at the surface--distorts surface fibers and raises the grain. Sunlight, air, and water on the surface cause chemical changes that produce first brown then gray color and make lignin and cellulose partly soluble. Similar erosion and leaching of fuel-moisture-indicator sticks would cause a loss of weight and consequent inaccuracy.

    Publication Notes

    • Visit PNW's Publication Request Page to request a hard copy of this publication.
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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Morris, William G. 1959. Effect of weathering on accuracy of fuel-moisture-indicator sticks in the Pacific Northwest. PNW Old Series Research Notes No. 171, p. 1-6

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