This part of IEC 60424 gives a guidance on allowable limits of surface irregularities applicable to RM-cores in accordance with the relevant generic specification.
This standard should be considered as a sectional specification useful in the dialogue between ferrite core manufacturers and customers about surface irregularities.
IEC 60424-2:1997 history
2015IEC 60424-2:2015 Ferrite cores - Guidelines on the limits of surface irregularities - Part 2: RM-cores
1997IEC 60424-2:1997 Guidance on the limits of surface irregularities of ferrite cores - Part 2: RM-cores