The Isotropic Super Finishing Process

Conversion coating principle
Conversion coating principle

During the ISF Process the active chemistry used in the refinement stage reacts with the metal parts being finished in the vibratory finishing machine to produce a stable, soft conversion coating. This coating is typically black in colour.

At the start of the ISF Process, the original metal surface reacts a first time with the active chemistry to form the first Conversion Coating.

The vibratory finishing machine and non-abrasive media produce a rubbing motion on the sur­face of the metal parts. This rubbing motion removes the Conversion Coating from the peaks but not from the valleys of the metal surfaces. This exposes the peaks of the metal surfaces to a second reaction re-forming the complete Conversion Coating. The process of Conversion Coat­ing re-formation and removal is continued through many successive cycles. This process is continued until the metal parts are refined to the required surface finish quality.

Once the required surface finish quality is achieved, the active chemistry from the refinement stage of the ISF Process is drained away and a neutral burnishing soap is introduced into the mass-finishing machine. The burnish removes all remaining Conversion Coating from the surface of the parts, produces a specular bright appearance and a mild rust resistant surface. The parts are ready for unloading and the ISF Process is complete.


Flash Animation of the ISF-process

The conversion coating
principle animated.
Start animation



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