
Testing of petroleum products; determination of neutralization number; colour indicator titration; refrigerator oils
出版:German Institute for Standardisation (Deutsches Institut für Normung)

專(zhuān)家解讀視頻
Applies to unused refrigerator oils as specified in DIN 51503, with a maximum colour number of 2,0 as defined in ISO 2049.
ISO 7537:1997 - Identical