The responses so far have established that what you have is not ENIG.
40 uins of gold is not recommended for soldering. The gold in the solder
joint would be excessive (>3%) and embrittlement will occur.
The Ni thickness is way below spec for Al wire bonding also.
My 2 cents worth.
Regards
George Milad
George Milad
National Accounts Manager for Technology
Uyemura International Corp (UIC)
249 Town Line Rd
Southington CT 06489
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