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Lab talk, the good, the bad, and the ugly
Metal
Bridges Gassing
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<blockquote data-quote="pingvin" data-source="post: 46179" data-attributes="member: 3134"><p>desertfox384, what furnace do you use?</p><p></p><p>I use Ivoclar Programat 100. Ivoclar furnaces differ much to Vita furnaces. I had lots and lots of problems with bubbles in EX3, but this baking schedule is 100% bubble free for Ivoclar furnaces:</p><p></p><p>Co-Cr, sandblast, rinse under clean running water, dry with hear dryer.</p><p>Mix POBA in the jar with it's liquid, dilute extra if needed (in winter a drop or two).</p><p>Apply POBA, preheat furnace to 100 C, open, put in, close, start, press once (not twice) stop to hold temperature at 90 C. Hold for 20 min. Carry on with baking. Before first opaquer bake WAIT for the furnace to cool down (furnace head open),I usually wait until temperature reaches 60 C, then I put in first opaquer. When you close the furnace head the temperature rises to some 80 C, by presing start and stop (once) you control the rise of the temperature until it reaches 90. Dry for 20 minutes, then repeat.</p><p></p><p>This is 100% bubble free, I can guarantee this by several thousand baked crowns. If bubbles appear then opaquer or POBA froze during transport and has to be changed!</p><p></p><p>One of my first bridges looked like this (it is interesting that only one half of the bridge was infected, this is due to the fact that head of the furnace in Ivoclar is inclined in approximately 45 degree angle and that part of the bridge was closer to the heating chamber, and opaquer got more boiling:</p><p>[ATTACH=full]1546[/ATTACH]</p></blockquote><p></p>
[QUOTE="pingvin, post: 46179, member: 3134"] desertfox384, what furnace do you use? I use Ivoclar Programat 100. Ivoclar furnaces differ much to Vita furnaces. I had lots and lots of problems with bubbles in EX3, but this baking schedule is 100% bubble free for Ivoclar furnaces: Co-Cr, sandblast, rinse under clean running water, dry with hear dryer. Mix POBA in the jar with it's liquid, dilute extra if needed (in winter a drop or two). Apply POBA, preheat furnace to 100 C, open, put in, close, start, press once (not twice) stop to hold temperature at 90 C. Hold for 20 min. Carry on with baking. Before first opaquer bake WAIT for the furnace to cool down (furnace head open),I usually wait until temperature reaches 60 C, then I put in first opaquer. When you close the furnace head the temperature rises to some 80 C, by presing start and stop (once) you control the rise of the temperature until it reaches 90. Dry for 20 minutes, then repeat. This is 100% bubble free, I can guarantee this by several thousand baked crowns. If bubbles appear then opaquer or POBA froze during transport and has to be changed! One of my first bridges looked like this (it is interesting that only one half of the bridge was infected, this is due to the fact that head of the furnace in Ivoclar is inclined in approximately 45 degree angle and that part of the bridge was closer to the heating chamber, and opaquer got more boiling: [ATTACH=full]1546[/ATTACH] [/QUOTE]
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Lab talk, the good, the bad, and the ugly
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Bridges Gassing
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