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Abstract

Softwoods (SW, spruce and fir) and hardwoods (HW, ash and beech) were thermally modified by the thermo-vacuum (Termovuoto) process for 3-4 h in the temperature range 160-220 degrees C (TMW160-220 degrees C) and their fungal durability were examined in soil-block tests with two brown rot (BR, Postia placenta, Gloeophyllum trabeum) and two white rot (WR, Pycnoporus sanguineus, Phlebia radiata) fungi. SW-TMW160-220 degrees C were exposed to P. placenta and P. sanguineus and HW-TMW190-220 degrees C to all fungal species. Considerable improvement (durability class 1-3) in decay resistance was only achieved for SW-and HW-TMW 220 degrees C. Thermal modification (TM) below 200 degrees C influenced decay resistance negatively in case of some fungal species applied for both SW and HW. Judged by the durability class, decay resistance was higher in HW- than in SW-TMW at high TM temperature. Behavior of TM differed significantly between ash (ring-porous HW) and beech (diffuse-porous HW). A comparison between results of soil-and agar-block tests on Termovouoto wood demonstrated that the influence of testing method in terms of assignment to durability classes is not significant.

Keywords

brown rot; decay resistance; soil-block test; thermal modification (TM); thermo-vacuum (Termovuoto) process; white rot

Published in

Holzforschung
2016, volume: 70, number: 9, pages: 877-884

SLU Authors

  • Gao, Jie

    • Department of Forest Products, Swedish University of Agricultural Sciences

  • Kim, Jongsik

    • Department of Forest Products, Swedish University of Agricultural Sciences

  • Terziev, Nasko

    • Department of Forest Products, Swedish University of Agricultural Sciences

  • Daniel, Geoffrey

    • Department of Forest Products, Swedish University of Agricultural Sciences

UKÄ Subject classification

Wood Science

Publication identifier

  • DOI: https://doi.org/10.1515/hf-2015-0244

Permanent link to this page (URI)

https://res.slu.se/id/publ/72728