Question

What type of fluid do hydraulic devices use to exert pressure?

Answer 1

The type of fluid hydraulic devices use to exert pressure is in-compressible liquid.

• The in-compressible liquids are as follows:

• Mineral oils – products of refining crude oil  
• Fire-resistant fluids – there are 4 main types. HFAE, Type HFC, Type HFAB and Type HRAS.  
• Water/oil emulsions – this is when the predominant substance (around 60%) in the oil.  
• Water glycol - made up of 40% water and 60% glycol
• Phosphate Esters