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2023 Proficiency Test (PT) on Liquefied Butane 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 iis23S03B here: the letter of instructions and the report form here


Summary of this proficiency test:


On 7 June 2023 the proficiency test on Liquefied Butane started with 50 participants from 27 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: Propane, Propene, iso-Butane, n-Butane, 1-Butene, iso-Butene, trans-2-Butene, cis-2-Butene, 1,3-Butadiene, n-Pentane, iso-Pentane, Molar Mass, Relative Density at 60/60F, Vapour pressure at 40°C and Vapour pressure at 100F, MON and Ideal Gross/Nett Heating Value.  


The deadline for reporting results is set on 14 July 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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