Proficiency Test on Caustic Soda 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 iis16C06 here: The letter of instructions and the  report form.

Summary of this proficiency test:

On 10 August 2016 the proficiency test on Caustic Soda started with 32 participants from 19 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 have to be analyzed on Appearance, Density @20°C, Sodium Chloride, Sodium Chlorate, Sodium Sulfate, Alkalinity and Iron.

The deadline for reporting results is set on 23 September 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