THE FIRE HAZARD inherent in the use of petroleum based hydraulic fluids for many industrial applications has been such that ‘safe’ fluids were demanded, appeared and are today widely and increasingly used. Their composition is either completely non‐petroleum or includes petroleum fluid in a modified state. In the former category are the phosphate esters or chlorinated hydrocarbon liquids and the water/glycol solutions ; in the latter we find the W/O of ‘inverted’ oil and water emulsions.
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