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Licensed Unlicensed Requires Authentication Published by De Gruyter August 31, 2020

Decay, insect, and termite resistance of wood modified with epoxidized vegetable oils

  • Gaye Kose Demirel EMAIL logo , Ali Temiz , Sabrina Palanti and Nasko Terziev
From the journal Holzforschung


Samples of Scots pine sapwood were treated with epoxidized linseed and soybean oils to improve decay, insect and termite resistance of wood. Non-epoxidized (raw) linseed and soybean oils were included as reference treatment in the study. In the epoxidation process, hydrogen peroxide was used to open double bounds, and acetic acid was added as a catalyst. Two retention levels, Ret A (80–140 kg m−3) and Ret B (170–270 kg m−3), two impregnation methods (full cell and empty cell) and emulsion technique were used. Samples treated with epoxidized oils had significantly lower mass losses than untreated samples while epoxidized oils showed higher mass losses than unepoxidized oils for Coniophora puteana and Trametes versicolor according to EN 113 for decay test. By adding boron, fungicidal properties were introduced to the treatment. All the vegetable oils showed 100% the mortality rate against larvae of Hylotrupes bajulus according to EN 47. Moreover, leached wood samples treated with oils also showed 100% larvae mortality. Additionally, termite testing based on EN 117 revealed 100% Reticulitermes lucifugus mortality for all leached oil treated samples.

Corresponding author: Gaye Kose Demirel, Department of Forest Industrial Engineering, Karadeniz Technical University, Trabzon, 61080, Turkey, E-mail:

Funding source: The Scientific and Technological Research Council of Turkey

Award Identifier / Grant number: TOVAG 114O265

Funding source: The Scientific and Technological Research Council of Turkey

Award Identifier / Grant number: 2214/A

Funding source: The Scientific and Technological Research Council of Turkey

Award Identifier / Grant number: COST Action FP 1407 STSM


The authors would like to gratefully acknowledge Federico Stefani (CNR IBE) for his help in CNR IBE laboratory. Some parts of this article were presented at “Cost Action FP 1407 Final Conference-Living with modified wood” in Belgrade, Serbia.

  1. Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: The authors acknowledge the Scientific and Technological Research Council of Turkey (TUBITAK, project code: TOVAG 114O265 and 2214/A), COST Action FP 1407 STSM for the financial support, and CNR IBE (former CNR IVALSA) in Italy for conducting part of the research in their laboratory.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.


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Received: 2019-12-26
Accepted: 2020-06-25
Published Online: 2020-08-31
Published in Print: 2021-03-26

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