Permeability of Twenty-Two Small Diameter Hardwoods Growing on Southern Pine Sites


  • E. T. Choong
  • F. O. Tesoro
  • F. G. Manwiller


Gas permeability, liquid permeability, longitudinal permeability, transverse permeability, specific gravity


Gas permeability of hardwoods growing on southern pine sites is significantly affected by moisture content in the longitudinal direction. The ratio of permeability in the transverse to longitudinal directions is from 12,000:1 for post oak to over 1,000,000:1 for other oaks, but it is not affected by moisture. Although variation in longitudinal permeability varies greatly between and among species, for most species there was no height effect. A significant difference was detected between sapwood and corewood only in the longitudinal direction. Gas permeability tended to be somewhat less than liquid permeability.


Behk, E. A., I. B. Sachs, B. K. Kukachka and J. O. Blew. 1969. Microscopic examination of pressure-treated wood. For. Prod. J. 19(8): 31-40.nBuro, A., and E. Buro. 1959. Untersuchungen über die Durchlässigkeit von Kiefernholz. Holz Roh- Werkst. 17 (12):461-474.nChoong, E. T., and P. J. Fogg. 1968. Moisture movement in six wood species. For. Prod. J. 18(5):66-70.nChoong, E. T., and O. K. Kimbler. 1971. A technique of measuring water flow in woods of low permeability. Wood Sci. 4(1):32-36.nChoong, E. T., and P. J. Fogg. 1972. Variation in permeability and treatability in shortleaf pine and yellow poplar. Wood Fiber 4(1):2-12.nChoong, E. T., P. J. Fogg, and F. O. Tesoro. 1972. Relationship of fluid flow to treatability of wood with creosote and copper sulfate. Proc. AWPA 68:235-248.nChoong, E. T., C. W. McMillin, and F. O. Tesoro. 1975. Effect of surface preparation on the gas permeability of wood. (Submitted to Wood Science)nComstock, G. L. 1965. Longitudinal permeability of green eastern hemlock. For. Prod. J. 15(10):441-449.nComstock, G. L. 1968. Relationship between permeability of green and dry eastern hemlock. For. Prod. J. 18(8):20-23.nComstock, G. L. 1970. Directional permeability of softwoods. Wood Fiber 1(4):283-289.nErickson, H. D. 1970. Permeabiilty of southern pine wood—a review. Wood Sci. 2(3):149-158.nFogg, P. J. 1969. Longitudinal air permeability of four species of southern pine wood. Wood Sci. 2(1):35-43.nIsaacs, C. P., E. T. Choong, and P. J. Fogg. 1971. Permeability variation within a cotton-wood tree. Wood Sci. 3(4):231-237.nResch, H., and B. A. Ecklund. 1964. Permeability of wood, exemplified by measurements on redwood. For. Prod. J. 14(5):199-205.nSiau, J. F. 1970. Pressure impregnation of refractory woods. Wood Sci. 3(1):1-7.nSiau, J. F. 1971. Flow in wood. Syracuse Univ. Press, Syracuse, N.Y. 122 pp.nSmith, D., and B. Lee. 1958. The longitudinal permeability of some hardwoods and softwoods. Spec. Rep. For. Prod Res. (London), No. 13. 13 pp.nTesoro, F. O. 1973. Factors affecting flow of gas and liquid through softwoods and hardwoods. Ph.D. dissertation, Louisiana State University, Baton Rouge.nTesoro, F. O., E. T. Choong, and C. Skaar. 1966. Transverse air permeability as an indication of treatability with creosote. For. Prod. J. 16(3):57-59.nTiemann, H. D. 1910. The physical structure of wood in relation to its penetrability by preservative fluids. Am. Railway Eng. and Maint. Way Assoc. Bull. 120:359-375.n






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