Click here to go back to the previous page


2021 Proficiency Test (PT) on AP & APEO 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 iis21T01 here: the letter of instructions and the report form here



Summary of this proficiency test:


On 10 February 2021 the proficiency test on AP & APEO in Textile started with 50 participants from 18 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: OP, NP, OPEO, NPEO and Total of OP, NP, OPEO and NPEO.  


The deadline for reporting results is set on 19 March 2021. 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





©1996-2023 Institute for Interlaboratory Studies