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Author Topic: Signs of Zinc in the mix  (Read 631 times)

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Offline Haywire Haywood

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Signs of Zinc in the mix
« on: October 04, 2005, 02:25:47 PM »
I've read many times that zinc would ruin a batch of alloy.  

What are the signs of zinc in the mix?

Ian
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Offline ShadowMover

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Signs of Zinc in the mix
« Reply #1 on: October 04, 2005, 03:38:23 PM »
The thing I've noticed most showing zinc in a melt is a 'skin' forming on the surface even after a good fluxing and stirring. The skin interferes with ladle pouring. Since I'm old fashioned, and have not used my 'new' bottom pouring electric pot as much, I don't know what effect the zinc has on them. It sure doesn't take much zinc to make it skin. Another sign you have a problem, is the presence of a floating silver chunk long after everything else has melted. Mystery metal, Uh-oh!
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Offline Lloyd Smale

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Signs of Zinc in the mix
« Reply #2 on: October 04, 2005, 11:06:21 PM »
ive never had wheelwieghts that had enough in it to effect casting but ive tired casting with pure zinc. Its a real bugger to get good bullets with unless you run the pot extreemly hot and it takes alot of work when your done to clean the molds and pot to get rid of the contamination. So if your getting real pour fillout in molds with alloys that have worked in the past id would suspect it could be zinc.
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