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Showing results for tags 'alumina'.
FranzBernhard posted a topic in Fossil PreparationSome of you may have noticed my flat polished fossils and fossil rocks. A few of you have some of them in their hands, e.g. @ricardo, @taj, @Monica, @fifbrindacier, @marguy I lost access to the cutting, grinding and polishing facility recently. No great loss, but I still have some small specimens that I want to have polished. What to do? I tried a low-cost, low-effort approach, using things I already have. 1. Cutting: I tried to cut some small specimens with an angle grinder. Well, it worked, more or less. Not the best option, don´t to it. Better would be a tile sa
Well I finally managed to acquire 5 kilograms of aluminum tri hydrate Al(OH)3 with 100% guaranteed to be smaller than 200 mesh and 90% guaranteed to pass through a 300 mesh screen. The tests I ran were as is; unscreened out of the bag. The tests were using a COMCO air abrasion unit at varying presures from 2 PSI to 90 PSI. I paid $35 for 5 kilograms (about 11 pounds). The material seems to be very consistant in size definately under 50 microns. A small particle size is good for delicate prep work. The data sheet that came with the product rates it as non hazardous which is a very good thing ,