[ATM] microgrit (was: Gugolz pitch)

[David Adams <elrey314159265359@yahoo.com>]

I am looking for a source for 30u, 15u, and 9u "specially shaped"
aluminum oxide powders, but the Salem site does not indicate they
carry these anymore?  Do you just have to call and ask?  Or do I 
need to go to another source?

I also noted that the SSI ebay store charges 3x for shipping 
what they charge for product.

David

--- William Marriott <bmarriott@pacbell.net> wrote:

> Hello;
> 
> I have, over the years, found that the tried and true
> method of fine grinding with aluminium oxide lapping
> powders, which are specially shaped for their
> application, is the best way to go.  If you can do a
> nice 9u fine grind, or maybe 5u if your area is clean,
> the mirror will polish out just fine, with cerium
> oxide.
> 
> Both commercially and astronomically, I have not
> figured out why people use Zirconium oxide, but some
> people do seem to get positive results.
> 
> Bill Marriott
> VA Optical Labs
> 
> 
> 
> 
> 
> --- Mitch <funnybone101@earthlink.net> wrote:
> 
> > Is there an advantage to of Zirconium Oxide over
> > Aluminum Oxide?
> > for smaller sizes?
> > 
> > Isn't Aluminum oxide for grinding? Zirconiums is for
> > polishing, and slowly
> > at that.
> > 
> > Mitch
> > 
> > 
> > _______________________________________________
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> > 
> 
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