Development and comparison of test methods for evaluating formation of biofilms on silicones
2002 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 78, no 2, 257-262 p.Article in journal (Refereed) Published
Silicone rubber formulations used for outdoor high voltage insulation are sometimes reported to be colonized by microorganisms. Different formulations show different sensitivity towards biological growth. In this study five rubbers were tested. Two standard practices were used, ASTM G21-90 and IEC 68-2-10. In addition a new method was developed to measure the rate of colonisation of a sample by biological growth. Results showed that the tested rubbers supported fungal growth when an external carbon source was available. Thus none of the silicones can be called bio-resistant. However the materials are not biodegradable either. This was clearly shown when mould spores were added to the samples in clean water, when none of the rubbers was contaminated. Some of the materials did, however, support growth when only nutrient salts, no carbon source, was added. The most bioresistant formulations contained the flame retardant zinc borate, indicating that this additive suppresses fungal growth. Further investigation with the new method supported that theory.
Place, publisher, year, edition, pages
2002. Vol. 78, no 2, 257-262 p.
Biofilm, Biological growth, Flame retardants, Fungus, High voltage insulation, Silicone rubber
IdentifiersURN: urn:nbn:se:kth:diva-5032DOI: 10.1016/S0141-3910(02)00140-4ISI: 000178534800007OAI: oai:DiVA.org:kth-5032DiVA: diva2:7660
QC 20100908. Uppdaterat från In press till Published (20100908)2005-04-182005-04-182010-09-08Bibliographically approved