Analysis of Microbial Tolerance and Physicochemical Properties of HFA-E Hydraulic Fluids Used in Mechanized Mine Roof Supports

tests confirmed the inherent antimicrobial activity of the fluids, which significantly reduced planktonic microbial viability and eradicated the majority of bacteria. The physicochemical properties of the fluids remained stable even under high initial bacterial load, confirming their reliability during microbial contamination. However, under industrial conditions, the Hydrotol-ITCh HFAE-based fluid demonstrated lower contamination and higher emulsion stability (pH reduced to 8.5 after one year of operation versus 6.5 for "Fimitol P87 AF"), which reduced the risk of biocorrosion and the need for additional treatments. This study emphasizes the importance of comprehensive monitoring of microbial diversity and physicochemical parameters for predicting the service life of hydraulic systems, developing effective biocides, and minimizing risks to equipment and personnel. The obtained data can be used to optimize hydraulic fluid compositions and their operational strategies.