Potential utilization of sodium fluoride (NaF) as a biocide in particleboard production

Author

• Cihat Tascioglu
  • 1
  Email author
• Kenji Umemura
  • 2
• Sukma S. Kusuma
  • 2
• Tsuyoshi Yoshimura
  • 2

1. 1.Department of Forest Products Engineering, Faculty of ForestryDuzce UniversityDuzceTurkey
2. 2.Research Institute for Sustainable Humanosphere (RISH)Kyoto UniversityUjiJapan

Original article

First Online: 07 August 2017

Abstract

The feasibility of sodium fluoride (NaF) incorporation as a biocide in the manufacture of particleboard was examined. Laboratory-scale particleboards prepared from untreated wood particles were incorporated with NaF powder at target retentions of 1, 1.5 and 3% of the total particle weight. An in-line treatment method was used to introduce the biocide during the blending stage just before adhesive application. Standard static bending and water resistance (water absorption and thickness swelling) tests indicated that embedding of the powder biocide up to the 3% level did not cause any detrimental effects on mechanical and physical properties. The laboratory decay and termite resistance tests showed that even the lower retention levels of 1 and 1.5% NaF were enough to suppress fungal and termite activity and significantly reduce the mass loss and consumption rate values of the specimens when compared to the untreated controls. Spectrophotometric analysis of leachate waters and the mass losses of the leached specimens revealed the tendency of the NaF to be depleted from the composite specimens. Therefore, the tested biocide was found to be appropriate for interior or protected above-ground outdoor exposure conditions.

Acknowledgements

The first author extends his appreciation to RISH, Kyoto University, for support under the Visiting Professor program between April 1 and September 29, 2016, and to Mr. Akio Adachi for specimen preparations and Ms. Nuriye Peaci for English proofreading of the manuscript.

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