Volatility Characteristics of MIL-L-7808 Turbine Lubricants
Abstract
An investigation of MIL-L-7808 lubricant volatility was conducted using ASTM Test Methods D972 and D2878 and by using thermogravimetric analysis. This investigation was conducted to: (1) investigate wide variations in manufacturer's reported batch-to-batch evaporation values which were not supported by gas chromatography, (2) determine evaporation and vapor pressure values of current MIL-L-7808 qualified lubricants using ASTM Test Methods D972 and D2878 and, (3) determine the value of using thermogravimetric analysis for measuring lubricant volatility. Individual esters, lubricant basestocks and formulated lubricants of known composition were investigated under varying parameters of temperature, gas flow rates and test times. Calibration procedures and check-out of equipment is described. This investigation has shown that batch-to-batch variation in lubricant volatility does not exist to the extent reported by batch-to-batch quality control testing and that ASTM Method D972 is satisfactory for measuring MIL-L-7808 lubricant evaporation characteristics. Recommendations are given which will enable each laboratory to evaluate test equipment and technique. This investigation has also shown that thermogravimetric analyses does not possess any advantages over ASTM Methods D972 and D2878 for measuring MIL-L-7808 lubricant volatility characteristics. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1975
- Accession Number
- ADA015034
Entities
People
- H. A. Smith
- P. W. Centers
Organizations
- Air Force Research Laboratory