Impregnated and covered birch plywood performance during external exposure

We evaluated the performance of covered and impregnated birch plywood (BP) in the outdoor environment. Fungal growth, crack formation, and surface hydrophobicity were regularly assessed over 36 months. After 2 months, uncovered BP was severely colonised by disfiguring fungi. During the test period,...

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Bibliographic Details
Published in:Wood material science and engineering 2018-01, Vol.13 (1), p.21-27
Main Authors: Andersons, Bruno, Andersone, Ingeborga, Zudrags, Kaspars, Sansonetti, Errj
Format: Article
Language:English
Subjects:
Aureobasidium pullulans
Biocides
Birch plywood
Blue stain
coating
Crack propagation
disfiguring fungi
Exposure
external exposure
Fungi
Hydrophobicity
impregnation
Laminates
lamination
Melamine
Phenols
Plywood
Protective coatings
Rot
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Summary:We evaluated the performance of covered and impregnated birch plywood (BP) in the outdoor environment. Fungal growth, crack formation, and surface hydrophobicity were regularly assessed over 36 months. After 2 months, uncovered BP was severely colonised by disfiguring fungi. During the test period, the surface of plywood with better coatings (solvent- or water-based) was not overgrown or was overgrown slightly with fungi, no cracks were formed, and the surface hydrophobicity was stable. Similar results were observed for laminates with phenol and melamine film. Plywood impregnated with copper and organic biocides, with retention conforming to Use Class 3 (EN 335:2013), did not protect the plywood from crack formation within several months and the severe growth of disfiguring fungi within a year. The blue stain fungus Aureobasidium pullulans was identified for all overgrown test variants. No rot fungi were detected after a 36-month exposure.
ISSN:1748-0272
1748-0280
DOI:10.1080/17480272.2016.1231715