Finishing coating: immersion gold
Immersion gold (ENIG) is a chemical precipitation of a gold layer on a nickel sublayer. One of the main alternatives to HASL technology. It is a finishing coating of Ni / Au category (Immersion Gold + Electroless Nickel).
The basic thickness of the gold layer is 0.05−0.1 micron of nickel 3−7 micron. The material meets all the mandatory requirements of EU RoHS directive.