Abstract

Microbial contamination of metal cutting fluids is of concern to industries that manufacture them and use them, particularly because more than 29 species of bacteria, including actually or potentially pathogenic strains, were isolated from a soluble metal cutting fluid. This microbial proliferation has a negative effect on the quality and performance of the fluids, but mainly poses risks to the health of exposed workers, including skin problems, irritation and breathing difficulties. In addition, cases of allergic alveolitis have been diagnosed in this population.
This preliminary research, carried out in three plants, studied the microbial contamination of metal cutting fluids using performing tools never used beforehand. Very high levels of bacterial contamination were observed in these fluids, whose initial physicochemical characteristics were changed. However, the bacteria found in greater quantity do not seem to be responsible for the development of respiratory abnormalities. However, the authors believe that the hypothesis by which these bacteria could have other health effects should be tested.