This International Standard provides standard AL values (inductance factors) and their tolerances of Pot@ RM@ ETD@ E@ EER@ EP@ PQ and low-profile gapped ferrite cores.
IEC 62358:2012 history
2012IEC 62358:2012 Ferrite cores - Standard inductance factor for gapped cores and its tolerance
2004IEC 62358:2004 Ferrite cores - Standard inductance factor (A<(Index)L>) and its tolerance