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Anatomical approach to evaluating the treatability class of five species of plantation timbers

  • M. Sujatha
  • D. Venmalar
Original Article
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Abstract

An increasing industrial demand for timber and the depletion of durable wood species in India have encouraged the utilization of many nondurable species which require protection against biodegradation. Such protection is usually carried out by pressure-impregnating toxic chemicals as wood preservatives. To study the treatability class of plantation timbers with water- and oil-type wood preservatives by an anatomical approach, five species of plantation timbers, Acacia auriculaeformis, Acacia mangium, Eucalyptus eurograndis, Eucalyptus tereticornis and G. arborea, were treated with two stains, silver nitrate and red oil. Their absorption was calculated, penetration of stains was studied anatomically, and their specific gravity was also calculated before the treatment. Based on the penetration with silver nitrate stain, A. auriculaeformis, A. mangium, E. eurograndis and E. tereticornis were classified under treatability class ‘c’ and G. arborea was classified under treatability class ‘d’ and with red oil stain, A. mangium was classified under treatability class ‘b’, E. eurograndis was classified under treatability class ‘c’, and A. auriculaeformis, E. tereticornis and G. arborea were classified under treatability class ‘d’. From the values obtained with the two stains, overall treatability class of A. auriculaeformis was ‘d’, A. mangium and E. eurograndis were class ‘c’, and E. tereticornis and G. arborea were class ‘d’. The absorption of the preservatives shows that the specific gravity does not affect the absorption.

Keywords

Plantation timbers Wood preservative Silver nitrate stain Red oil stain Anatomical Specific gravity Treatability class 

Notes

Acknowledgements

The authors express their sincere thanks to the Director General, ICFRE (Grant No. IWST/WPU/XI/84), for funding this project.

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Copyright information

© Indian Academy of Wood Science 2019

Authors and Affiliations

  1. 1.Institute of Wood Science and TechnologyMalleswaram, BangaloreIndia

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