In the sequence of CIPM key comparisons concerning volume calibrations an interregional comparison CCM.FF-K4 was performed between December 2003 and March 2005 for volume standards of 20 L and 100 mL. The corresponding regional part of this comparison within Europe was performed in 2006 for a 100 mL Gay-Lussac Pycnometer—EUROMET.M.FF-K4 (EUROMET project number 692). It was decided during the EUROMET meeting in Istanbul 2007 to also perform the regional part of this key comparison at 20 L, as EURAMET.M.FF-K4.b (EURAMET project number 1008).

This comparison was guided by IPQ (Portugal) with SP (Sweden) acting has the pilot laboratory having taken part in the interregional exercise. Fourteen countries decided to participate in this comparison.

One of three 20 L pipettes, 710-04FyV used in the CCM.FF K4, was readjusted by CENAM (Mexico), which initiated this key comparison and produced the transfer standard.

The main purpose of this project was to compare the experimental results and uncertainty calculations in calibrating this 20 L pipette and linking the intra-regional European results with the results obtained in the previous inter-regional CIPM key comparison.

The results of all laboratories participating in EURAMET project 1008 are presented in this report as well as their equivalence with the reference value of the key comparison CCM.FF-K4.

Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.

The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).