Types Of Hydraulic Fluids (Type 2 and 3)

Petroleum Based Fluids(Type 2)
These are the commonly used fluids for hydraulic applications where there is no danger of fire,no possibility of leakage that may cause contamination of  other products,no wide temperature fluctuation and no environmental impact.
Advantages
Excellent lubricity,reasonable cost,non-corrosive
Disadvantages
-Tendency to oxidize rapidly
-Not fire resistance
Synthetic Based Fluids(Type 3)
There are 3 types of synthetic based fluids.

1. Phosphate esters
2. Chlorinated hydro carbons
3. It is a synthetic base mixture of phosphate esters and chlorinated hydro carbons and do not contain avatar or volatile materials,and they provide satisfactory operation at higher temperatures.these are suitable for high pressure applications.so specific gravity of these type of fluids is high.

Halogenated hydro carbons fluids are inert odorless non-fameble,non-corrosive and have low torcicity.