One uses "deburring media". It's most often odd-shaped (stars, squares,
triangles) of high-alumina ceramic in the range of 95% aluminum-oxide to 5%
porcelain clay.

It's readily available from most machining supplies like MSC or McMaster
Carr.

LLoyd

"Jerry Foster" wrote in message
om...
I just got a small tumbler that I intend to use for de-burring small
aluminum parts. Does anyone have any advice on what media to use in it?
I
was thinking of trying sandblasting sand... And any idea of about how
long
to run it?

Jerry