[CAUT] source for 3m microfinishing film?

[Fred Sturm]

The specs for this stuff is 5 mil film, seems like Mylar, some sort of  
polyester I believe, with 100, 60 and 30 micron aluminum oxide grit.  
272L is the 3M product code. Jurgen's source is Andre, who got it from  
Germany. It is a very firm film, which makes for excellent control of  
how level you can make the crown, among other features. I love it. The  
grit particles are metered very precisely, and are laid out very  
evenly on the film. BTW, 100 micron is sort of the same grit as 100  
paper, but cuts more, and the 60 is maybe like 180, the 30 like 320.  
It's a completely different way of naming, since it is based on the  
size of the particles, not the number per surface area.
	The one problem I have is that the grits tend to get clogged a bit  
with wool fibers, but that is easily remedied by slapping the paper  
against the hammer every stroke or two.
Fred
On Sep 23, 2009, at 8:51 AM, Fred Sturm wrote:

> On Sep 23, 2009, at 8:01 AM, John Minor wrote:
>> Anyone have a source for this polyester backed sandpaper in small  
>> quantities?
>>
>> John Minor
>> University of Illinois
>
> If you are after the stuff Andre Oorebeck talks about in his book,  
> Jurgen is selling it at pianofortesupply. A kit of strips (3 grits)  
> plus a clear sanding "block" with a strip (for fitting hammers, as  
> illustrated in the book) is $15 (he had them at the conventon). I  
> got some full sheets from him for $10 each. This is a very stiff  
> backing, and will last a lot of sets of hammers (I expect I am  
> stocked for the rest of my career). I am not familiar with the stuff  
> Micromark sells (Jon Page's source), but it is not the same from the  
> description, though perhaps similar enough that it would be a less  
> expensive substitute. I searched the 3M site for the product, and,  
> well, gave up. They show it only in discs and belts, best I can  
> figure out.
>
>
> Regards,
> Fred Sturm
> University of New Mexico
> fssturm at unm.edu
>
>
>
>
>

Regards,
Fred Sturm
University of New Mexico
fssturm at unm.edu