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2023 Proficiency Test (PT) on Liquefied Propane 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 iis23S04P here: the letter of instructions and the report form here

Download the instuctions for iis23S04S here: letter of instructions for Sulfur and the report form here


Summary of this proficiency test:


On 27 September 2023 the proficiency test on Liquefied Propane started with 66 participants from 31 different countries. On that date, the samples were dispatched to the laboratories. Enclosed to the sample is 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 enter the date of receipt and press the "save date" button.


The samples can be analyzed on: Ethane, Propane, Propene, n-Butane, iso-Butane, 1-Butene, iso-Butene, n-Pentane, iso-Pentane, Molar Mass, Relative Density at 60F, Vapour pressure at 100F / at 40°C, Ideal Gross/Nett Heating Value and MON.


The sample iis23S04S can be analyzed on: Total Sulfur. 


The deadline for reporting results is set on 3 November 2023. 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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