SIM.M.V-S2 Supplementary comparison of kinematic viscosity measurements of standards liquids

Main text This report describes the SIM Supplementary comparison of kinematic viscosity measurements of standards liquids of two National Metrology Institutes (NMIs) carried out in the period from March 2025 and June 2025. Two samples of Newtonian liquids with nominal kinematic viscosities of 120 mm 2 /s at 20 °C, 90 mm 2 /s at 25 °C, and 45 mm 2 /s at 40 °C for sample 1 and 4710 mm 2 /s at 20 °C, 3310 mm 2 /s at 25 °C and 1270 mm 2 /s at 40 °C for sample 2 were used to determine the degrees of equivalence between the NMIs. The mean values obtained by CENAM, pilot laboratory in the CCM.V-K4 comparison, were used as reference values for this SIM comparison. The comparison includes an escrow, which was responsible for collecting the results from both the pilot and the participant after the measurements, and then forwarding them to the pilot laboratory for report preparation. 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 https://www.bipm.org/kcdb/ . The final report has been peer-reviewed and approved for publication by the CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).