Every medical product, from a walker to the fabric cover of the seat back of a wheel chair, must fulfill particular demands of biological compatibility. Here also all wood- and furniture surfaces are concerned, which in-patients come in contact with. For this, our coating material is applied onto a glass plate and examined by an independent test institute according to the biological test of the EN ISO 10993-1:2003. For the intended use of a product, a period of less than 24 hours contact with intact skin is provided. Therefore, for the assessment of the biological compatibility a test for cytotoxity - in which the cytotoxic effects are tested - according to EN ISO 10993-5 (1999) is considered to be applicable. Here, the reaction of particular cells - in vitro - to the test piece is examined.