The C6WL coating, polycrylo nitrile resin in chromate base equivalent to C5 of AISI, provides good surface resistivity both before and after stress relief annealing. Presences of organic part ensures improved punch and die life during stamping operations. During annealing, the organic part of the coating volatilizes but inorganic part remains to provide an adherent film with a high level of surface resistivity. No significant flaking occurs at the punched edges of laminations. Significant punchability improvement (min 2 times of bare steel) and adequate surface insulation resistance despite low coating thickness are obtained with this type of coatings.

Used for refrigerator motors, small to large sized motor. C6WL coatings are useful for small and medium sized motors where high temperature resistance and weldability are required.