This International Standard specifies a test method for the mechanical strength of cores made of magnetic oxides. This test method is suitable for most of the E-cores, ETD-cores and I-cores but other core types such as U-cores could be tested according to a derived method agreed by the parties concerned.
GSO IEC 61631:2014 history
2014GSO IEC 61631:2014 Test method for the mechanical strength of cores made of magnetic oxides