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Lab talk, the good, the bad, and the ugly
Metal
spruing FGC techniques
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<blockquote data-quote="PDC" data-source="post: 97727" data-attributes="member: 3385"><p>For your C&B 69% Au: I would use 2 turns on the casting machine. I would burn out at around 800-815 C for about 45 minutes and then lower the temp to 537 C before casting. This metal has a much lower melting point and the ring needs to be cooler so the metal can cool faster. This prevents the casting from staying hot for so long and acting kind of like a button trying to cool.</p><p></p><p>We used to use Beauty Cast (Whip Mix) years ago with a low burnout and never had porosity problems. </p><p>I think you will find this will solve the issue...the reservoir is still a good idea on very heavy crowns.</p><p></p><p>Hope this helps.</p></blockquote><p></p>
[QUOTE="PDC, post: 97727, member: 3385"] For your C&B 69% Au: I would use 2 turns on the casting machine. I would burn out at around 800-815 C for about 45 minutes and then lower the temp to 537 C before casting. This metal has a much lower melting point and the ring needs to be cooler so the metal can cool faster. This prevents the casting from staying hot for so long and acting kind of like a button trying to cool. We used to use Beauty Cast (Whip Mix) years ago with a low burnout and never had porosity problems. I think you will find this will solve the issue...the reservoir is still a good idea on very heavy crowns. Hope this helps. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
spruing FGC techniques
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