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Post by tortuga on Apr 7, 2010 16:34:51 GMT -5
I picked up a crate of about 50# of grit today from a relative who inherited a bunch of rocks and supplies. Made a flat offer for the entire crate and they accepted so I came home and started looking through the bags. Most of the stuff was labeled, but some of it just said 3F and 4F. Is this 400 & 600 grit respectively? What does the F signify? Also had a bunch of "white rouge" which I hadn't encountered yet, and an unmarked bag of some stuff that looked to have the same consistency but a little darker shade of white, almost a light tan. Any idea where to start to figure out what that stuff might be? Was pleasantly surprised to find a couple lbs of cerium in there too  |
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revco
starting to spend too much on rocks
Another Victim Of The Rockcycle
Member since February 2010
Posts: 162
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Post by revco on Apr 7, 2010 18:37:46 GMT -5
From a quick search, the "F" indicates that the SiC was manufactured according to the internationally recognized "FEPA" standard for abrasives. These basically regulate size, shapes, coatings and other factors relating to abrasives.
White rouge is a polishing compound and it's typically used with precious metals.. There are three different types - red, green and white. Red is typically used with gold/silver/etc. The green and the white are typically too abrasive to work with metals. I'm not sure what they would compare to in the AlumOx/SiC world, but I would guess it would probably function more as a pre-polish then a polish.
Sounds like an awesome score! Woot!
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Post by johnjsgems on Apr 7, 2010 19:21:58 GMT -5
3F is ungraded 400 grit or 300 and finer. 5F is 500and finer also called 600 ungraded. Mixed grade or ungraded are less expensive than graded400or 600 Tan polish could be diatomaceous earth which is marketed as a polish. 60/90 was known as 80 ungraded back in the day.
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Post by tortuga on Apr 7, 2010 19:28:25 GMT -5
johnjsgems, thanks for the info, would you be willing to accept an envelope with a tablespoon or so of white powder in it? you seem to know what youre talking about re: grits so if you're OK with it i'd like to mail you a bit of it to see if you can ID it actually looking at it, because I'm not going to bother using it till I know what it is. PM me with a mailing address if you don't mind, i promise it wont be anthrax |
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Post by johnjsgems on Apr 7, 2010 19:48:57 GMT -5
There are just too many white polishes to identify by sight. I found a barrel in my dad's stuff I was sure was some kind of plaster. The third time I moved the barrel I found a tag on the handle that said titanium dioxide. There is a white rouge used for silver and white metal polish but I've only seen it in bar form. Your best bet would be to try a little on a buff or in a tumbler and see how it works.
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