Sapphire is mohs 9

Karl

----- Original Message -----
From: "Al Knoll" <al_knoll@PACBELL.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Tuesday, February 05, 2002 10:40 AM
Subject: Re: OT: Window Glass

> The paint pros use #00 fresh steel wool for taking overspray off the
glass.
>
> I don't know the Moh hardness of FE203 but the aluminum oxide on those
> scotchbrite (tm) pads will scratch just about anything.  Saw a former
> neighbor taking bugs off the front of his new Chevy Blazer with one.  I
> mentioned that it might leave scratches, he said it's ok that his wife
uses
> one on the dishes.
>
> Later I saw him working with a little Dupont #7 rubbing compound.
>
> Sapphire is aluminum oxide nicely arranged.
>
> pensioner