Certification of the cold filter plugging point (CFPP) and the cloud point (CP) of gas oil : certified reference material ERM-FC395k : certification report

This report describes the production of ERM-FC395k, a gas oil material certified for cold filter plugging point (CFPP) and cloud point (CP). The material has been produced following ISO Guide 34:2009 . A mixture of hydrotreated straight-run distillates and cracked diesel fractions without flow improvers and fatty acid methyl esters was obtained. The material was ampouled in amber glass ampoules. Between unit-heterogeneity has been quantified and stability during dispatch and storage have been assessed in accordance with ISO Guide 35:2006. Within-unit heterogeneity has been quantified to determine the minimum sample intake. The material was characterised by an intercomparison among laboratories of demonstrated competence and adhering to ISO/IEC 17025 . Technically invalid results were removed but no outlier was eliminated on statistical grounds only. Uncertainties of the certified values were calculated in compliance with the Guide to the Expression of Uncertainty in Measurement (GUM), including uncertainties related to possible heterogeneity and instability and to characterisation. The material is intended for the quality control and assessment of method each 27 mL of diesel performance. As any reference material, it can also be used for control charts or validation studies. The certified reference material (CRM) is available in sets of two glass ampoules containing closed under argon atmosphere. The contents of the two ampoules shall be mixed to obtain one sample of 50 mL. The CRM has been accepted as European Reference Material (ERM®) after peer evaluation by the partners of the European Reference Materials consortium.