The electrode classification E70T-10 can have some optional identifiers added to the end of the number such as E70T-10MJH8. These additions are used to add qualifiers to the general classification so that specific codes or standards can be met. These additions have the following meanings:
M-Mixed gas, 75% to 80% Ar, balance CO2. If there is no M, the shielding gas must be either CO2 or the electrode is self-shielded.
J-Describes the Charpy V-notch impact test value of 20 ft-lb at -40°F.
H8-Describes the residual hydrogen levels in the weld: H4 equals less than 4 ml/l00 g; H8, less than 8 ml/100 g; H16, less than 16 ml/l00 g.