JNiolon@uss.com wrote:
> Surely someone can explain to me what the grades of sandpaper stand for ??
When I look at "80 grit" paper..
> what does the 80 signify ??
It depends. At one time it denoted the number of grit particles that would
fit in a certain area, but things have evolved. There are different
standards for the grit sizes. The two most common here in the US are CAMI
numbers that are generally used on dry-sanding papers, and the FEPA "P"
designations that are generally used on wet-sanding papers.
The following page has a comparison for a good range of these abrasives:
http://www.ameritech.net/users/knives/grits.htm
The official FEPA site has a table that lists the grit sizes in micrometers
for the "P" abrasives:
http://www.fepa-abrasives.org/fepap-e.htm
Harry Phinney
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