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Old November 30, 2011, 12:30 PM   #10
hornetguy
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Join Date: January 14, 2011
Location: on the north side of DFW
Posts: 802
Well, the good old interweb says that zinc melts at 787.1 degrees F... so, unless you have a good casting thermometer in your smelting pot, you could easily go over that temp and melt in the zinc.. apparently it happens a LOT, according to the posts I've read on other casting forums.
In fact, many folks actually cast in the ballpark of 700 deg, so it wouldn't be difficult to go over that by 80 or 90 degrees without realizing it (without a thermometer, of course)

If you come up slowly with the temps, yes, they will float. If you have a pot already "hot" and you dump in more ww's, you could melt the zinc ones down pretty quickly, if you've drifted up on your temps..
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