The possible significance of the lignin content and lignin type on the performance of CCA-treated timber in ground contact

IRG/WP 1357

T Nilsson, J R Obst, G F Daniel

The lignin in wood samples of Alstonia scholaris, Octomeles sumatrana and a Simaruba species have been analysed. These timbers are characterised by a high lignin content and low syringyl:guaiacyl ratios. Decay tests with two soft rot fungi showed that the timbers were less susceptible than timbers with a low lignin content and higher syringyl:guaiacyl ratios. Numerous data for field performance of Alstonia and limited information on treated Octomeles and Simaruba suggest that timbers with a high lignin content and low syringyl:guaiacyl ratios will perform well in ground contact when treated with CCA.


Keywords: CCA PERFORMANCE; LIGNIN TYPE; LIGNIN CONTENT; SOFT ROT; SYRINGYL/GUAIACYL RATIOS; TROPICAL HARDWOODS; PREMATURE FAILURE

Conference: 88-04-24/29 Madrid, Spain


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