Click here to go back to the previous page


2019 Proficiency Test (PT) on Gasoil 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 iis19G01EN here: the letter of instructions and the report form here.

Download the instuctions for iis19G01CN here: letter of instructions for Cetane Number & DCN and the report form here.

Download the instuctions for iis19G01TC here: letter of instructions for Total Contamination and the report form here.

Download the instuctions for iis19G01OX here: letter of instructions for Oxidation Stability and the report form here.


Summary of this proficiency test:


On 20 February 2019 the proficiency test on Gasoil started with 165 participants from 57 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: Acid Number, Ash content, Calc. Cetane Index, Cloud Point, CFPP, Carbon residue, Copper Strip at 50°C, Density at 15ºC, Distillation at 760 mmHg, FAME content, Flash Point PMcc, Kinematic viscosity at 40°C, Lubricity by HFRR, Mn, Nitrogen, PAHs, Pour Point, Sulphur content, Water, Cetane Number & DCN, Total Contamination and Oxidation Stability.


The deadline for reporting results is set on 29 March 2019. 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