The result evidenced that the hydrophobic admixtures based on modified polysiloxans, pulverized silikones and terpolymers bysed on vinylchloride, ethylene, vinylester and vinyllaurate are resistant to the growth of bacteria. The zinc stearate is not resistant. The hydrophobic admixtures Wacker BS 1306 and Wacker BS Pulver are working against teh growth of fungi in fungicidal way. (en)