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2017 Proficiency Test on Base Oil finished.


The full report can be downloaded (as .pdf-file). To download the report, please click the right mouse button and choose the "save as" option.

 - Download the report (iis17L03) of this Proficiency Test on Base Oil.  


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Summary of this proficiency test:


On 7 August 2017, the proficiency test on Base Oil (iis17L03) was finished. It started on 26 April 2017 (see message "Proficiency Test on Base Oil " on this website) when the samples were distributed.

On that date, the samples were dispatched to the laboratories. Enclosed to the sample is the material safety data sheet (MSDS).


In this interlaboratory study 55 participants in 33 different countries have participated.


The proficiency test report summarises per test, the test results, the analytical methods reported by the participants and the z-scores calculated for each participant are tabulated. Also, for each test, the calculated summary (e.g. mean, standard deviation and reproducibility) is given.


In the report also an evaluation of the test results is given. Problems encountered in the analyses are mentioned and - where possible - suggestions for quality improvement are formulated. For each test a comparison is made between the results of the group of participants and the requirements given by the relevant standard (e.g. EN, ISO, DIN, ASTM).


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