[BProckets] Cerimac grinding media

[Bill McAlister]

Ok i went and looked at the media i bought(first time since i bought it) and it apears its not ceramic.
 
The invoice reads 90% Alumina Grinding media 25mmx25mm
 
I have to admit my ignorance in this but what is Alumina and is it safe to grind with? I bought this off of a fellow pyro whom is a very knolagable rocketeer. It has the feel of ceramic but must not be.

fitzskis at fuse.net wrote:
Bill, I'd recommend Lloyd Sponenberg's ball milling book as far as loading specs for a mill. Basically, fill half the jar with media and add enough comp to fill the voids in the media after it's been running for a while. As for ceramic media....there are varying opinions of same....I use all lead. If you're a member of the PML, go to the archives and look up making BP, under my name, with pyro baseball in the search. You'll find an article on tests I did with homemade BP. Basically, well milled 75/15/10, granulated with denatured alcohol to about 2FA makes very servicable BP. Good luck, Ned
> 
> From: Bill McAlister 
> Date: 2004/09/22 Wed PM 12:25:03 GMT
> To: Black Powder rockets discussion list 
> Subject: Re: [BProckets]
> 
> Im just getting started in makeing rockets. I would like to make my BP insted of buy it. Is this realy feesable time and money wise? I have an exelent ball mill and ceramic media. the ball mill is about 1 gal capasity. How much would you recomend makeing for a first time batch. ..I plan on makeing 4lbs rockets
> 
> Any sugestions or first time traps to avoid? 

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