Pressure Impregnation of Hardwoods: Treatment Schedules For Easy-To-Treat Indian Hardwoods


  • Satish Kumar
  • R. P. Sharma
  • P. B. Dobriyal
  • B. B. Chaubey


Hardwoods, CCA, penetration indices, treatability, pressure treatment schedules


On the basis of penetration pattern of inorganic chemicals in the wood microstructure, penetration indices for different wood species were developed. Pressure treatment schedules have been suggested on the basis of penetration index and gross absorptions obtained with CCA salts in treatability class 'a' and 'b' hardwoods. Mango and kadam earlier placed under the 'a' treatability class have been transferred to the 'b' treatability class because of poor penetration of the fibers in these species. Similarly, white bombwe earlier classified under class 'b' has been shifted to class 'a' because of its high penetration index.


ANON. 1981. Water borne wood preservatives: Copper chrome arsenic composition. Indian Standard 10013 (Part II). Bureau of Indian Standards, Manak Bhavan, New Delhi.nANON. 1982. Code of practice for preservation of timber. Indian Standard 401. Bureau of Indian Standards. Manak Bhavan, New Delhi.nAston, D., and R. W. Watson. 1976. The performance of preservative treated hardwoods in ground contact. B.W.P.A. Ann. Conv. 41-53.nAWPA. 1987. Book of standards. Amer. Wood Preservers' Assoc., Stevensville, MD.nChaubey, B. B., P. B. Dobriyal, and Satish Kumar. 1986. Structural factors affecting penetration of fluids in Indian hardwoods: A microscopic study. J. Timb. Dev. Assoc. (India) 32(2):5-11.nChaubey, B. B., P. B. Dobriyal, and Satish Kumar. 1987. Relationship between longitudinal gas permeability and treatability in hardwoods. J. Timb. Dev. Assoc. (India) 33(3):25-35.nDickinson, D. J., and N. A. A. H. Sorkhoh. 1976. The microdistribution of wood preservatives. Scanning electron microscopy 1976 I.I.T.R.I., Chicago. Pp. 549-554.nGreaves, H. 1977. An illustrated comment on the soft-rot problem in Australia and Papua New Guinea. Holzforschung. 28(5): 193-200.nHudson, M., and S. V. Shelton. 1969. Longitudinal flow of liquids in southern yellow pine poles. Forest Prod. J. 19(5):25-32.nKumar, S., and B. B. Chaubey. 1987. Studies on permeability variation within tropical hardwoods of Indian origin. J. Timb. Dev. Assoc. (India) 33(1):26-34.nKumar, S., and P. B. Dobriyal. 1983. Flow paths in selected softwoods and hardwoods. J. Timb. Dev. Assoc. (India) 29(3):26-33.nKumar, S., and R. P. Sharma. 1982. Pressure impregnation of hardwoods. I Treatment schedules for easy-to-treat wood species. J. Timb. Dev. Assoc. (India) 28(4):24-29.nStamm, A. J. 1964. Wood and cellulose science. Ronald Press, New York.n






Research Contributions