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2018 Proficiency Test (PT) on Cyclohexane started


The letter of instructions can be downloaded here as a pdf document. To download a document, please click the right mouse button and choose the "save as" option.


Please download the instructions for the PT iis18X01 here: the letter of instructions



Summary of this proficiency test:


On 14 February 2018 the proficiency test on Cyclohexane started with 12 participants from 9 different countries. On that date, the samples were dispatched to the laboratories. Enclosed to the sample is the material safety data sheet (MSDS).

Please confirm sample receipt as soon as you have received and checked the contents of the sample package via Please enter the date of receipt and press the "save date" button.


The samples can be analyzed on: Acid wash color, Appearance, Colour, Density at 20°C, Distillation, Freesing Point, Purity of Cyclohexane, Benzene, n-Hexane, Methylcyclohexane, Methylcyclopentane, Refractive Index at 20°C, Sulphur and UV Absorbance.


The deadline for reporting results is set on 23 March 2018. A laboratory that reports test results after the deadline will definitely not get direct feedback in case any of its results are suspect! So be in good time to get the most out of this proficiency test.

The test results should be reported via our internet based results reporting platform A login and a password can be requested via email to





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