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Eingeladener Vortrag
- nein (3)
The fungus cellar test is a common means to get reliable data on the long term performance of treated wood in soil contact. A constantly high humidity and a suitable of water holding capacity for a range of micro-organisms provide high decay rates in untreated wood and produce intensive microbial pressures on wood treated with biocides. Presently a range of biocides are under test in the BAM fungus cellar and the results will be presented for the following types of biocides: Tebuconazole in combination with copper and boron (5 years fungus cellar), quats with copper and boron (5 years fungus cellar) and Cu-organic compound combined with copper and boron (3 years fungus cellar). Figures will be shown on the development of the Modulus of Elasticity (MOE) over the years and on an assessment of the stakes according to EN 252.
Biological testing of wood
(2006)
Biogenic impact on materials
(2011)
Materials as constituents of products or components of technical systems rarely exist in isolation and many must cope with exposure in the natural world. This chapter describes methods that simulate how a material is influenced through contact with living systems such as microorganisms and arthropods. Both unwanted and desirable interactions are considered. This biogenic impact on materials is intimately associated with the environment to which the material is exposed (Materials-Environment Interaction, Chap. 15). Factors such as moisture, temperature and availability of food sources all have a significant influence on biological systems. Corrosion (Chap. 12) and wear (Chap. 13) can also be induced or enhanced in the presence of microorganisms. Section 14.1 introduces the categories between desired (biodegradation) and undesired (biodeterioration) biological effects on materials. It also introduces the role of biocides for the protection of materials. Section 14.2 describes the testing of wood as a building material especially against microorganisms and insects. Section 14.3 characterizes the test methodologies for two other groups of organic materials, namely polymers (Sect. 14.3.1) and paper and textiles (Sect. 14.3.2). Section 14.4 deals with the susceptibility of inorganic materials such as metals (Sect. 14.4.1), concrete (Sect. 14.4.2) and ceramics (Sect. 14.4.3) to biogenic impact. Section 14.5 treats the testing methodology concerned with the performance of coatings and coating materials. In many of these tests specific strains of organisms are employed. It is vital that these strains retain their ability to utilize/attack the substrate from which they were isolated, even when kept for many years in the laboratory. Section 14.6 therefore considers the importance of maintaining robust and representative test organisms that are as capable of utilizing a substrate as their counterparts in nature such that realistic predictions of performance can be made.
Prüfung der Widerstandsfähigkeit von Furnierplatten gegenüber holzzerstörenden Basidiomyceten
(1984)
Ein 1982 vorgeschlagenes Laborverfahren zur Prüfung der vorbeugenden Wirkung von Holzschutzmitteln in Furnierplatten mit holzzerstörenden Basidiomyceten sieht als Nährboden Vermiculit + Nährlösung + Futterholz vor. Es wurden Versuche mit verschiedenen Nährlösungen durchgeführt, wobei mit einer Puffer-Malz-Lösung die besten Ergebnisse erzielt wurden. Mit ihr wurden auch bei Braunfäulepilzen am Vollholz und an Furnierplatten befriedigende Holzabbauwerte erreicht. Neben den im Prüfvorschlag genannten Kulturflaschen nach pr EN 113 erwiesen sich Einweg-Kunststoffbecher als Kulturgefäße als gut geeignet. In einem Versuch mit Furnierplatten, die mit einem Klebstoff hergestellt waren, dem ein Holzschutzmittel untergemischt war, waren auch bei einer hohen Schutzmittelkonzentration noch erhebliche Masseverluste durch Trametes versicolor festzustellen. In den durchgeführten Versuchen erbrachten Trametes versicolor CTB 863 A. Lentinus cyathiformis CTB 67-02 B, Stereum spec. BAM 544 und Gloeophyllum trabeum BAM Ebw. 109 gute Holzabbauwerte bei Furnierplatten aus verschiedenen Holzarten bzw. -Kombinationen. Zur endgültigen Festlegung der Prüfpilze sind weitere Versuche mit Furnierplatten sowie mit weiteren Pilzstämmen erforderlich.