This alloy will be designated in accordance with the UNE 38-300 standard, as follows: 2.1 Numerical designation Numerically it will be designated: L-3140 UNE 38-314 and when plated LP-3140 UNE 38-314 2.2 Symbolic designation It will be designated symbolically : A/-4Cu 1Mg UNE 38-314 and when plated AI-4Cu 1Mgpl UNE 38-314