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Moisture dynamics of WPC as basis for biological durability

Nele Defoirdt UGent, Joris Van Acker UGent and Jan Van den Bulcke UGent (2010) International Research Group on Wood Protection, 41th Annual meeting, Proceedings.
abstract
The largest market for wood-polymer composites (WPCs) is currently decking. Although many products are commercially available, a proper standard for the assessment of the biological durability of WPC does not exist. Recommended standards for testing resistance against basidiomycetes should be completed with a method to bring the specimens in a worst case situation, obtaining a moisture level high enough to initiate and support fungal growth at the beginning of, or early in the test. In this study a simple, but efficient way to increase the moisture level of test specimens of 9 commercialized WPC decking products is presented. The 24 h air-drying period after 4 weeks immersion in warm water strongly reduced the high moisture content (MC) of the wood particles, but the induced thickness swell may allow a quicker re-moistening. Performing a fungal test with these moistened specimens, Coriolus versicolor caused 2 – 15% mass loss (ML) and Coniphora puteana 1 – 12% ML despite of the poor virulence of latter fungus. ML was correlated with the MC after incubation and the thickness swell due to the pre-treatment. The ability of fungal spores to settle on WPC surfaces was investigated as well by placing specimens in a cabinet loaded with mist saturated with fungal spores and an equivalent outdoor test setup. Linking results to the composition or production process is difficult and was not the main goal of this research, but PVC based materials clearly performed the worst: high water absorbing and thickness swell, the highest ML in lab-based fungal testing and the most distinct fungal staining during outdoor exposure.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
WPC, wood-polymer composites, biological durability, fungal testing, moisture dynamics, wood-plastic composites
in
International Research Group on Wood Protection, 41th Annual meeting, Proceedings
article_number
IRG/WP 10-40520
pages
14 pages
publisher
International Research Group on Wood Protection
place of publication
Stockholm, Sweden
conference name
41st Annual meeting of the International Research Group on Wood Protection (IRG/WP)
conference location
Biarritz, France
conference start
2010-05-09
conference end
2010-05-13
language
English
UGent publication?
yes
classification
C1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1105287
handle
http://hdl.handle.net/1854/LU-1105287
date created
2011-01-20 08:48:18
date last changed
2011-04-27 15:49:23
@inproceedings{1105287,
  abstract     = {The largest market for wood-polymer composites (WPCs) is currently decking. Although many products are commercially available, a proper standard for the assessment of the biological durability of WPC does not exist. Recommended standards for testing resistance against basidiomycetes should be completed with a method to bring the specimens in a worst case situation, obtaining a moisture level high enough to initiate and support fungal growth at the beginning of, or early in the test. In this study a simple, but efficient way to increase the moisture level of test specimens of 9 commercialized WPC decking products is presented. The 24 h air-drying period after 4 weeks immersion in warm water strongly reduced the high moisture content (MC) of the wood particles, but the induced thickness swell may allow a quicker re-moistening. Performing a fungal test with these moistened specimens, Coriolus versicolor caused 2 -- 15\% mass loss (ML) and Coniphora puteana 1 -- 12\% ML despite of the poor virulence of latter fungus. ML was correlated with the MC after incubation and the thickness swell due to the pre-treatment. The ability of fungal spores to settle on WPC surfaces was investigated as well by placing specimens in a cabinet loaded with mist saturated with fungal spores and an equivalent outdoor test setup. Linking results to the composition or production process is difficult and was not the main goal of this research, but PVC based materials clearly performed the worst: high water absorbing and thickness swell, the highest ML in lab-based fungal testing and the most distinct fungal staining during outdoor exposure.},
  articleno    = {IRG/WP 10-40520},
  author       = {Defoirdt, Nele and Van Acker, Joris and Van den Bulcke, Jan},
  booktitle    = {International Research Group on Wood Protection, 41th Annual meeting, Proceedings},
  keyword      = {WPC,wood-polymer composites,biological durability,fungal testing,moisture dynamics,wood-plastic composites},
  language     = {eng},
  location     = {Biarritz, France},
  pages        = {14},
  publisher    = {International Research Group on Wood Protection},
  title        = {Moisture dynamics of WPC as basis for biological durability},
  year         = {2010},
}

Chicago
Defoirdt, Nele, Joris Van Acker, and Jan Van den Bulcke. 2010. “Moisture Dynamics of WPC as Basis for Biological Durability.” In International Research Group on Wood Protection, 41th Annual Meeting, Proceedings. Stockholm, Sweden: International Research Group on Wood Protection.
APA
Defoirdt, N., Van Acker, J., & Van den Bulcke, J. (2010). Moisture dynamics of WPC as basis for biological durability. International Research Group on Wood Protection, 41th Annual meeting, Proceedings. Presented at the 41st Annual meeting of the International Research Group on Wood Protection (IRG/WP), Stockholm, Sweden: International Research Group on Wood Protection.
Vancouver
1.
Defoirdt N, Van Acker J, Van den Bulcke J. Moisture dynamics of WPC as basis for biological durability. International Research Group on Wood Protection, 41th Annual meeting, Proceedings. Stockholm, Sweden: International Research Group on Wood Protection; 2010.
MLA
Defoirdt, Nele, Joris Van Acker, and Jan Van den Bulcke. “Moisture Dynamics of WPC as Basis for Biological Durability.” International Research Group on Wood Protection, 41th Annual Meeting, Proceedings. Stockholm, Sweden: International Research Group on Wood Protection, 2010. Print.