META-PLATE 4121 is an easy-to-use Electroless Nickel Process specifically formulated to provide an insoluble barrier deposit onto zincated aluminum prior to electroless nickel plating. With over 75 years of electroless nickel research and development experience, Metal Chem offers this newest EN formula to meet and exceed most competitive EN processes available today. The use of this bath will significantly extend the bath life of the electroless nickel plating solution on aluminum and approach that commonly attained when plating steel.