What is hydraulic fluid typically made of?

Hydraulic fluid is typically made of oil-based or water-based fluids because these types of fluids provide the necessary properties for effective hydraulic system operation. Oil-based fluids, such as mineral oils, offer excellent lubrication, high viscosity, and good thermal stability, which are crucial for minimizing wear in hydraulic components and maintaining performance under varying temperature conditions. Water-based fluids, on the other hand, can provide benefits such as lower flammability and lower cost but may have limitations in terms of lubrication and temperature resistance compared to oil-based options.

Using a combination of both types allows for a range of formulations tailored to specific applications, taking into account factors like operating temperature, pressure, and required lubrication properties. The choice of hydraulic fluid is critical in ensuring the efficiency and longevity of hydraulic systems.