A technique for the rapid assessment of wood surface degradation during weathering

IRG/WP 2281

P D Evans, D Abbott, S Thein

Radiate pine (Pinus radiata D. Don) sapwood samples taken from four trees were converted into thin strips 100 x 10 x 0.085 (85 µm) mm³, (longitudinal x radial x tangential) in size and exposed in preweighed hatches to the weather inclined at 45° facing equatorially for 10, 20, 40, 60, 80 and 100 days. Significant (P < 0.001) weight losses occurred with time over the exposure period. Differences between samples were non significant. Chemical analysis indicated a progressive increase in surface solubility resulting in significant losses of polysaccharides and lignin.


Keywords: WEATHERING; PINUS RADIATA; WEIGHT LOSS; LIGNIN; POLYSACCHARIDES; SOLUBILITY; SURFACE DEGRADE; UV LIGHT; HEXOSE SUGARS

Conference: 87-05-17/22 Honey Harbour, Ontario, Canada


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