ASTM D5480 Standard Test Method for Engine Oil Volatility by Gas chromatography
3. Summary of Test Method
3.1 The sample is mixed with an internal standard and a dilute tetracosane solution, and injected into a gas chromatograph. The column temperature is raised at a reproducible rate and the area under the chromatogram is recorded throughout the run. The retention time (RT) at 371°C(700°F)is calculated using linear regression, utilizing the n-paraffins comprising the internal standard and the tetracosane retention time/boiling point data. The area response (area/g) of the internal standard is related to the area of the sample determined to the 371°C RT to obtain the mass percentage of oil volatilized at 371°C.
4. Significance and Use
4.1 The determination of engine oil volatility at 371°C (700°F) is a requirement in some lubricant specifications.
4.2 This test method is intended to give a more precise measurement of oil volatility than that obtainable using the Noack method.
4.3 This test method can be used on lubricant products not within the scope of Test Method D2887.
