Proficiency Test on O-& P- Xylenes started

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

Download the instuctions for iis16C08 here: The letter of instructions and the  report form.

Summary of this proficiency test:

On 21 September 2016 the proficiency test on O-& P- Xylenes started with 30 participants from 17 different countries.

On that date, the samples were dispatched to the laboratories. Enclosed to the samples were the instructions to the participants for this proficiency test and 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 give date of receipt and press "save/button".

The samples can  be analyzed on  Appearance, Colour Pt/Co, Density at 20ºC, Organic Chloride, Distillation Range, Sulphur, Purity, Styrene and Toluene.

The deadline for reporting results is set on 28 October 2016. A laboratory that reports test results after 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