The conventional designation of the different grades is made up of the following symbols, in the order indicated: 1) the letters Fe V; 2) the maximum value, multiplied by percent, of the total specific losses for 50 Hz at 1.5 T; 3) the nominal thickness of the product, in millimeters, multiplied by percent; 4) the characteristic letters HA; 5) the reference to this standard (with express indication of its date). Example: Fe V 400-50 HA UNE 36-127-88