Originally Posted by
Lesslemming
I will jump in here, being a chemist I am sorry I have to disagree with you Hi-bud-gl,
I hope yo donīt take offense.
Chromium Oxide (ie Cr2O3) is the name of a pigment that is green in color.
Like ANY other pigment or cristalline structure there are many, literally infinately many variations
depending on how much time the crystalls had to bind each other
and some other variables like temperature and pressure I guess.
Thatīs why one could think of a single chromium oxide piece as big as the hope diamond.
Cr2O3 is a bad example for this, but how about Alumoxyde.
Al2O3 is available in any grit size, even as big as a palm
in the form of jade!
Believe me the molecular size of Cr2O3 is WAAAAAAAAAY smaller than 0.5 micron.
Cr2O3 has been commonly used as polishing compounds before,
thatīs why 0.3 to 0.5 micron particles were mainly produced.
But if you buy some chromium oxide you donīt have a clue what grain size it actually has!
Thatīs why we in germany use Lukas Acrylic Color with the Pigment PG17 (wich is Cr2o3),
it definitly has a grain size of 0.3 to 0.5 micron.
There are however many other grain sizes like 12 micron.
btw: this can not be solved by adding or taking some elements out of the compund.
Cr2O3 is Cr2O3 or its not our chromium oxide.
Being crystalline however we "could" say (Cr2O3)n
n being the number of molecules in one cluster.
But still this would not lead anywhere.
but to answer the original question: I donīt know of any source for chromium oxide
in 1 micron.
You should go for Al2O3 or Diamond