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2019 Proficiency Test (PT) on Benzene 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 iis19C04 here: the letter of instructions and the report form here.


Summary of this proficiency test:


On 6 February 2019 the proficiency test on Benzene started with 50 participants from 21 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, Acidity, Appearance, Bromine index, Total Chloride, Total Organic Chloride, Colour, Density at 20°C, Distillation, Total Nitrogen, Purity, Methylcyclohexane, Toluene, Nonaromatics, 1.4-Dioxane, Solidification Point, Sulphur, Water and Thiophene.


The deadline for reporting results is set on 15 March 2019. 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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