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Download the report (iis15L02) of this Proficiency Test on Base Oil

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Summary of this proficiency test:

On 7 July 2015, the proficiency test on Base Oil (iis15L02) was finished. It started on 15 April 2015 (see message “Proficiency Test on Base Oil started” on this website) when the samples were distributed.

In this international interlaboratory study 44 participants in 31 different countries have participated.

The participants were requested to determine Total Acid Number, Air release Time @ 50°C, Colour, CCR, Ramsbottom Carbon Residue, Density @ 15°C, Flash Point PMcc, Kinematic viscosity @ 40°C, Kinematic viscosity @ 100°C, Viscosity Index, Evap. Loss by Noack test, Viscosity Stabinger at 40°C and at 100°C, Pour Point Manual/ Automated, Sulphur, Water Content, , Water Separability. 

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. ISO, DIN, ASTM).