When certain bacteria and mold species grow on the surface of non-rigid, flexible or “plasticized” polymers, metabolites such as pigments in the case of certain bacteria and melanin (dark stains from fungal growth) cause undesirable stains on the polymer surface. These stains may persist even after the surface growth is removed. This test method is used to determine the performance of antimicrobial agents used in or on synthetic polymeric porous and non-porous materials against staining by the Actinomycete, Streptomyces species. This organism has been chosen as an indicator organism, although other organisms have been known to cause undesirable staining in polymeric porous and non-porous materials.
The title and scope are in draft form and are under development within this ASTM Committee.