A comparison of two methods for testing defined formulations of PVC for resistance to fungal colonisation with two methods for the assessment of their biodegradation

Using plasticised PVC of defined formulation containing a biocide, a comparison has been made of two methods used to assess resistance to fungal colonisation (inhibition of fungal spore germination and use as a carbon source by test fungi) with two physical methods used to assess biodegradation (changes in tensile strength and in extension under load). The results of the first two methods were easier to interpret, but there was general agreement with the results of the measurements of physical characteristics. There are however problems with the choice of methods for the assessment of bioresistance and biodegradation and these are discussed.