Proficiency Test on Mixed 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. The report form can  be downloaded on this site when deadline has expired.

Download for the main sample of iis15C11 the  letter of instructions and the  report form.

Summary of this proficiency test:

On 23 September 2015 the proficiency test on Mixed Xylenes  started with 34 participants from 20 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, forms for the reporting of the analysis results and the safety data sheet (SDS).

The samples can be analyzed on: benzene, Toluene, P/M/O Xylenes, Ethylbenzene, Cumene, sum of non aromatics, sum of C9 and heavier aromatics.

The deadline for reporting results is set on 23 October 2015. 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