DEVELOPMENT OF A WIDE-TEMPERATURE RANGE HYDRAULIC FLUID
Abstract
Work was performed to formulate an extreme low temperature hydraulic fluid that would show better physical and chemical stability at high temperatures than do the commonly used low temperature mineral oil based fluids. A synthetic fluid, tetra(2-ethylhexyl) orthosilicate, was selected as a base stock for the fluid. Various chemicals were examined for their effects on the base fluid's thermal stability and other properties. These chemicals included oxidation inhibitors, hydrolysis inhibitors, thickeners, and rubber swell improvers. Thermal stability tests at 700 deg F. showed the silicate fluid to be adversely affected by several frequently used additives. Unreactive, aromatic compounds were found that were compatible with the silicate fluid and also improved its rubber swell properties. A promising blend, No. 7M8, was evolved and evaluated for properties pertinent to hydraulic fluid use. Results indicated that this blend's properties were generally as good as or better than those of standard low temperature mineral oil based fluids. An outline of requirements for a Military Specification was prepared.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1967
- Accession Number
- AD0660314
Entities
People
- Ralph L. Lemar