What is the most common fluid used in hydraulic rescue tools?

The most common fluid used in hydraulic rescue tools is mineral-based hydraulic oil. This fluid is specifically designed to transmit force efficiently through the hydraulic system, allowing for optimal operation of rescue tools like cutters and spreaders. Mineral-based hydraulic oil has favorable characteristics, including high lubricating properties, thermal stability, and resistance to oxidation, making it ideal for the high-stress environments these tools operate in.

Using mineral-based hydraulic oil ensures that the tools can generate significant force needed to cut through metal or pry open vehicles during rescue operations. Additionally, this type of oil has a lower chance of causing corrosion in the hydraulic components and offers better performance in various temperature ranges compared to other potential fluids.

In contrast, other fluids listed are not suitable for use in hydraulic systems due to their inadequate performance characteristics or potential to damage hydraulic components. For instance, water can cause corrosion and freezing issues, glycerin is not commonly used in hydraulic applications, and petroleum jelly lacks the necessary fluidity and properties needed for hydraulic pressure systems. Thus, mineral-based hydraulic oil stands out as the optimal choice for hydraulic rescue tools.