DIN 51558-2
DIN 51558-2
Testing of mineral oils - Determination of neutralization number - Part 2: Color-indicator titration, insulating oilsstandard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/2017
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/2017