This report describes the production of ERM-EF002, which is a 100 % rapeseed oil based fatty acid methyl ester (biodiesel) material certified for cold filter plugging point (CFPP) and cloud point (CP). The material was produced following ISO Guide 34:2009 and is certified in accordance with ISO Guide 53:2006.
A mixture of fatty acid methyl esters (FAME) derived from rapeseed oil with the addition of 1 g/kg of butylhydroxytoluene (BHT) as antioxidant was obtained. Although FAME is the correct name, in this report, biodiesel is used as a better known synonym. The material was ampouled in amber glass ampoules.
Between-unit homogeneity was quantified and stability during dispatch and storage were assessed in accordance with ISO Guide 35:2006. Within-unit homogeneity was not quantified as minimum sample intake is defined by method and comprises the whole volume of the two ampoules of every unit.
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 inhomogeneity, instability and characterisation.
The material is intended for the quality control and assessment of method 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 each 27 mL of biodiesel closed under argon atmosphere. The contents of the two ampoules shall be pooled to obtain one sample of 50 mL.
The CRM was accepted as European Reference Material (ERM®) after peer evaluation by the partners of the European Reference Materials consortium.