where can i buy a fine mesh screen for separating aluminium powder?


hello,

i have discovered my ball mill with its large (2cm) grinding media, cant mill 100% of my aluminium powder, however it does mill roughly 50% after 8 hours, so i want to know where i can find a super thin aluminium mesh flake separator  which i can periodically sift out my powder, from the powder /flake mixture.
the powder size i am looking to sift, is sufficient for use in thermite and flash powder, essentially just standard super fine aluminium powder that stains whatever it touches silvery.

i have seen one before for sale on diversehobbies before, but now its gone, and i cant find one anywhere else. does anyone here know where i can find one online?

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jimcro556 years ago
Wire Mesh and Wire Cloth material made in the USA can be found here:

http://www.bwire.com/

Company has great service and very nice product. I searched around and didn't beat their price for the woven wire mesh material I was looking for.
oldmanbeefjerky (author)  jimcro556 years ago
well, i no longer need the mesh, but you are right, these prices are better than most i have encounterd
aeray6 years ago
Ceramics suppliers (for potters and sculptors) sell a variety of very fine sieves for processing wet and dry glaze and clay materials and mixtures. In fact, one of the largest manufactures of these sieves is Talisman, in New Zealand, almost right on your doorstep, in terms of world geography.
oldmanbeefjerky (author)  aeray6 years ago
actually, i am about 3000-4000km from tasmania.
though thanks, i cant beleive i overlooked that, as ive been meaning to buy some raw chemicals from this pottery supplier for some time now. ill need to include the sieve into my next order!
thanks,
ill wait a few days for any other responses before i mark your answer best!
New Zealand.
rickharris6 years ago
Would fly screen mesh work? You could put several layers together.
oldmanbeefjerky (author)  rickharris6 years ago
no, actually it wouldnt. fly screen mesh barely keeps out flies, actually letting in some of the smaller ones. i dont think its gonna keep out slightly larger than atomised aluminium flakes. even so, it would only mean that the smllest powder getts out faster, but its inevitable that it all gets out
mmm - Some time ago I built a cyclone to separate out very fine dust and plastic fibres from larger dirt & dust.

This worked well and by altering the air flow I could decide just how big the separation barrier was. Worth a thought - or put in water and centrifuge, the particles will layer in the liquid by weight.

Screening anything at such a fine level is going to be SLOW and hard to do.
oldmanbeefjerky (author)  rickharris6 years ago
oh no, i just wanna seperate the dust/flour sized partically which are indvidually invisible to the naked eye, from the ones which can be seen, which i would estimate are 10th of a millimeter wide.

i dont need to seperate stuff like 50 microns from 120 microns.
i just wanna sieve out the dust and not the small shavings
You can buy a variety of types of mesh screen at McMaster Carr:

http://www.mcmaster.com/#wire-screens/=cot2qg

This is just raw screen material that you could build into a frame for easy sifting. It looks like the material can usually be purchased in pieces as small as 12" X 12". I don't know what your price limit is, but it looks more or less affordable.

As for off the shelf stuff, I know I had a screen for keeping grease from spattering out of a frying pan. The mesh was much smaller than other strainer type utensils. Check out what is available in cooking utensils if you really need to do it on the cheap.
oldmanbeefjerky (author)  LargeMouthBass6 years ago
considering the fact thta im only going to be filtering secondary aluminium powder (ball milled mix without the balls), and that aluminium is a darn good reducing agent for even sand (takes the oxygen out of sand chemically), its gonna pretty much last for ever, ever being the time im gonna use it, so cost isnt much of an issue, but the ones avaliable on ebay, are prices ridiculously high.


anyway, how do i buy this mesh screen
http://www.mcmaster.com/#wire-mesh-screens/=cp893r
theres no price for it or anything, not exactly a very user friendly site.
The link I sent is just to the main page of the wire mesh section. There are all kinds of links for the different wire types, and then from there you have to click on other links to select different parameters related to the product, like the hole size, overall dimensions, etc.

It's actually a pretty easy site to navigate. You kind of have to "drill down" to the product you want, and only once you have narrowed it down considerably do the prices appear.