Abstract
The effect of 4 soft-rot fungi, isolated from a heavily destroyed railway sleeper, on the impact bending strength and loss of weight of bechwood was investigated. The relation between loss of strength and loss of weight varies, so that the loss of strength cannot be determined on the basis of the loss of weight. No constant ratio between the number of fibres attached and the wood strength was to be detected. The reduced impact bending strength of the wood being a phenomenon in soft rot, which for practical application is most important, it should be advisable to use as a criterion for testing the properties of fungi or preservatives not only the loss of weight, but also the effect on strength. The toxicity of sodium preservatives depends on the method of cultivation. Little differences in the nutrition can lead to remarkable changes in the toxic limit.
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