TThe tests were carried out at the normal load W equal to 0.25, 0.98, 5.13 and 19.3 N. This range corresponds to the dimensionless load W , see Eq. (1), varying between 0.00023 and 0.018. The maximum dimensionless load is thus here more than four times higher than the highest load applied in [4] in a study of the influence of load on friction of lubricated soft contacts.