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Fixed
Bubbles after second firing or glaze baking using NP metal
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<blockquote data-quote="2oothguy" data-source="post: 110571" data-attributes="member: 2405"><p>Make sure you are using enough air when you cast, this will cause problems for you in the porc dept if you dont. We cast with 40lb of air and 2lb of gas for non. . Also sandblast with 50 micron alum ox. We rinse off copings and place in ultra sonic for a min of 10 min. Then towel dry and degas. We use ceramco ultra paste with powder. Check your crucible may need a new one? If using a new one just heat it up and get a good glaze on it. Dont add any thing to it like some paste products or anything like it. no need Also make sure your casting machine and surrounding areas are clean every time before you cast. Just a quick wipe down. Also try a different kind of carbon my experience is that a few brands we used made matters worse.</p></blockquote><p></p>
[QUOTE="2oothguy, post: 110571, member: 2405"] Make sure you are using enough air when you cast, this will cause problems for you in the porc dept if you dont. We cast with 40lb of air and 2lb of gas for non. . Also sandblast with 50 micron alum ox. We rinse off copings and place in ultra sonic for a min of 10 min. Then towel dry and degas. We use ceramco ultra paste with powder. Check your crucible may need a new one? If using a new one just heat it up and get a good glaze on it. Dont add any thing to it like some paste products or anything like it. no need Also make sure your casting machine and surrounding areas are clean every time before you cast. Just a quick wipe down. Also try a different kind of carbon my experience is that a few brands we used made matters worse. [/QUOTE]
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Fixed
Bubbles after second firing or glaze baking using NP metal
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