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Trey Cornette
03-15-2012, 01:43 PM
Well I now have a little wire melter up and running. I use it to hold a small pot of clear to clear encase my soft glass marbles. I have found that the crucible I am using has 2 draw backs. One it is two large. I am keeping way more glass then I really need at working temp as well as the mass of the pot itself. Two it has a very slow heat up and cool schedule if I want it to last.
I am really leaning towards ordering some Assayer crucibles to try out. They are a smaller size and would be one shot throw away pots. I could heat and cool much faster therefore saving a lot of energy.
I know they will leach off some iron and could turn the glass green but I do not think this will really be to much of an issue. The pots will only be hot maybe 18 hours and how much iron could leech in that short a period.
So here is my question. I have found 2 types of pots. Of these 2 does anyone have an opinion as to which would be the better pot for my purpose.
Any help is greatly appreciate.

A.P. Green
http://www.lmine.com/mm5/merchant.mvc?Screen=PROD&Store_Code=LMS&Product_Code=17311-6&Category_Code=ap_green_repack

Fused Silica

http://www.lmine.com/mm5/merchant.mvc?Screen=PROD&Store_Code=LMS&Product_Code=17410&Category_Code=economy_repacks

Jordan Kube
03-15-2012, 02:21 PM
Hi-temp in Portland also has similar mullite crucibles for half the price.

http://www.ebay.com/itm/High-Fired-Crucible-5-ID-x-6-OD-x-7-1-2-high-/140513963219?pt=LH_DefaultDomain_0&hash=item20b748ecd3

Cheap enough to try it and see if you get the results you like.

Trey Cornette
03-15-2012, 02:28 PM
The ones I listed are for 6 packed for UPS That's like $10 each

Hi-temp in Portland also has similar mullite crucibles for half the price.

http://www.ebay.com/itm/High-Fired-Crucible-5-ID-x-6-OD-x-7-1-2-high-/140513963219?pt=LH_DefaultDomain_0&hash=item20b748ecd3

John Riepma
03-15-2012, 03:01 PM
Using ceramic coffee cups has been mentioned several times on this forum as a one-shot method for doing something like this or for small color batches. You can often get the big oversized ones at a dollar store. May want to try this first as the quickest/dirtiest/cheapest alternative.

Pete VanderLaan
03-15-2012, 03:15 PM
Fused silica is a one shot deal. You can turn them up only once. We probably do have better pricing at High temp. You can leach lots of iron in no time. It's a case of you get what you pay for.

Trey Cornette
03-15-2012, 04:32 PM
So I wonder how much you will notice any green from the iron in a less than 1/4 inch encasement over solid colors. My guess is not at all but I could be wrong.

If anyone knows of alternative crucibles that are in the $10-$12 range I would definitely like to hear about it.

Coffee mugs is an interesting idea but wouldn't the glaze materials leech into the glass and cause problems. I would not want to have marbles poping on customers due to a faulty clear.

I am not really trying to be overly cheap. Alumina crucibles just don't seem to fit my needs. I only need a small pot of clear once a week for about 8 hours to encase that weeks work. I want to fire quick and cool quick to save energy usage. Alumina won't take it and costs me about $70 a pop after shipping.
It's a green thing as well as economical.
I want to use less energy and find a crucible material that suits my needs.

Pete VanderLaan
03-15-2012, 05:18 PM
Less energy probably won't happen. Given what you are doing, the assay crucibles should be just fine. Coffee cups won't last very long.

Tom Fuhrman
03-15-2012, 05:21 PM
I have a former student that has a hot shop in Dyersburg that you may be able to rent some furnace time from. It may be easier to go just a few miles down the road and have a bigger pot and better glass to work with. PM me if you want their contact info. I do know it's convenient to have your own furnace though.

Dave Bross
03-16-2012, 09:42 AM
I see you've found Legend Reno. There's another source in this thread:

http://talk.craftweb.com/showthread.php?t=8779

Along with some interesting "drift" and other cheap pot info further along in that thread.