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2020 Proficiency Test (PT) on Organotin Compounds in Textile 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 iis20A19 here: the letter of instructions and the report form here



Summary of this proficiency test:


On 18 November 2020 the proficiency test on Organotin Compounds in Textile iis20A19 started with 92 participants from 27 different countries. On that date, the samples were dispatched to the laboratories.

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: Monomethyltin (MMT), Dimethyltin (DMT), Trimethyltin (TMT), Tripropyltin (TPT), Monobutyltin (MBT), Dibutyltin (DBT), Tributyltin (TBT), Tetrabutyltin (TeBT), Monooctyltin (MOT), Dioctyltin (DOT), Trioctyltin (TOT), Diphenyltin (DPhT), Triphenyltin (TPhT) and Tricyclohexyltin (TCyHT).  


The deadline for reporting results is set on 25 December 2020. 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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