Microfinishing film kit

The very best filling material for piano hammers. This is an industrial abrasive with very interesting characteristics and applications for piano technicians. The backing material is a fairly stiff and very durable mylar film. It has the advantage that it will only bend in one plane at a time. This helps to maintain flat filing surfaces and crisp and defined edges on hammers. It will not stretch and will never tear.  The grit itself is aluminum oxide – a sharp and durable abrasive. The grains are micro-sorted by size to a high degree of precision; this results in an aggressive cut, yet a smooth finish.

This material comes in 100µ, 60µ, 40µ, and 15µ which corresponds to 100, 200, 320 and 600 grit for fine polishing the striking surface.  This material’s amazing performance and durability makes it the abrasive of choice for hammer reshape. It will outlast any sandpaper.

The Microfinishing Film is sold in the Hammer Filing Strip Kit, consisting of four 2″ strips of different grits plus one plexiglass file for mating hammers to individual strings as shown in the  book  “The Voice of the Piano” by Andre Oorebeek.