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With these different roles in mind, it’s time to look at the hydraulic fluid characteristics that you should consider when choosing the right fluid for your system. Each of these characteristics has a range of possibilities. But to select the correct fluid means that you must be familiar with the requirements specified for your equipment. Our hydraulic manufacturer company can give you more insights if required.

Here are several of the most important hydraulic fluid characteristics you need to be aware of.

  • Viscosity: Viscosity describes how resistant a fluid is to flow — the higher the viscosity is, the thicker or more flow-resistant the fluid will be. Viscosity changes with temperature, with fluids becoming less viscous as they get warmer. Viscosity is an important factor in choosing a hydraulic fluid. 
  • Foaming Resistance: Foam can be a serious problem in a hydraulic system. Foam occurs when air becomes mixed into your hydraulic fluid. Because air is compressible, it can throw off the normal operation of your hydraulic pump. The most important step in eliminating foam is to ensure that your system is completely sealed.
  • Lubricity: Related to viscosity, a hydraulic fluid’s lubricity indicates how well it lubricates the machinery in your hydraulic equipment. With the right viscosity, your fluid should form a thin film on everything within your hydraulic pump, including the small spaces between tightly fitting pieces.