I cast PenCast 63 by Pentron and we burn out at about 1250 F but let the ring-less investment come back down to 1000 F before casting. Been using Whip mix Formula One. I also sprinkle a bit of borax based flux on the metal just as it starts to melt and have had GREAT results.
How far is your reservoir away from the wax pattern when you screw...I mean sprue? And what guage sprue are you using?
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