Fire-Resistant Hydraulic Fluids

Hydraulic is by far the simplest method to transmit energy to do work. It is considerably more precise in controlling energy and exhibits a broader adjustability range than either electrical or mechanical methods.
Mineral oil hydraulic fluids as a class are the most common hydraulic fluids used in the fluid power industry. Disadvantages of the use of mineral oil hydraulic fluids include flammability characteristics, potential biodegradability and exotoxicity problems where there is danger of leakage into underground aquifers, potential leakage into metalworking formulations and generally poor viscosity-temperature properties when used over a broad temperature range.
Although petroleum-oil hydraulic fluids provide outstanding performances, there are a number of application areas in which their high fire-risk potential with respect to equipment damage and loss of lives precludes their use.
Fire-Resistant hydraulic fluids (FRHFs), originally developed and commercialized for use in various industries where high-temperature processing was performed. High temperature uses include heat treating, plastics, zinc and aluminum, die casting, coal mining, iron and steel making, hydraulic presses, and machine tools for automotive industry.
All fire-resistant fluids fall into two basic categories: those that derive their fire resistance from the presence of water and those that demonstrate fire-resistant qualities by their chemical composition or molecular structure.

Iso Classification of Fire-resistant Hydraulic Fluids: