Water Glycols

These products are readily available from a large number of sources. They vary in their make-up, but generally contain above 35% water. They are moderately expensive. They require special attention to the type of paint used, but do not require different seals or o-rings from those used with mineral oil. Their V.I. is as good or better than mineral oil, and specific gravity more nearly equal to mineral oil. They perform well in vane pumps, gear pumps and some axial piston pumps. Their loss of water with increased system temperature may require addition of make-up water. While they should always be a first consideration in the selection of a fire-resistant fluid, they have a somewhat lesser spectrum of usability than the phosphate-ester type fluids. The extreme pressure additive system employed in Oiltech water-glycol enables their use in many high pressure systems for which conventional water-glycol fluids are not suitable. Conventional water glycol is normally rated to operate at below 2000 psi. Oiltech water glycols provide complete protection for the metals normally employed in hydraulic systems. They should not be used in systems incorporating magnesium alloys, because of their reactivity with water. Zinc and cadmium plated parts may be discolored by constant contact with Oiltech water glycol but there is no not effect on functional performance. Seals which absorb water are not suitable for use with water containing fluids - such as cork and leather material packing. Oiltech water glycols are not compatible with conventional paints. The inside surface of the system should be stripped of paint before installing any water glycol fluid. It is recommended that the maximum operating temperature of water glycol fluids be maintained below 65*C to prevent excessive evaporation of water. Oiltech provides fluid testing to determine the amount of water loss free of charge.

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