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Lab talk, the good, the bad, and the ugly
Zirconium
Zirconia Opaqueness & Shade Issues
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<blockquote data-quote="deadhead" data-source="post: 264181" data-attributes="member: 19095"><p>We have had the same issue in the past, and it took us a while to figure out what was going on because just like you our process didnt change(meaning our material, staining technique, oven and even the technician working on green state and staining never changed) After doing intensive investigating we found out that our issue was dirty heating elements and the brush that was being used for pre-staining had some old dry stain on the brush which was causing off coloring. Once we started cleaning our heating elements on a regular bases and started using new brushes every few weeks(well now we use pre shaded blanks so no more pre shading) our issue stopped and we started getting our normal results again. So basically it can come down to not the process itself but maybe the tools used for each step. From our experience we noticed that dirty brushes, hands, heating elements, and tools are usually the cause of most mis colors. Also your heating times play an important role because if your hold times or even how fast your temp rises and cools can play a role especially if the furnace is dirty the elements wont heat up properly causing issues with color or even cause cracking.</p></blockquote><p></p>
[QUOTE="deadhead, post: 264181, member: 19095"] We have had the same issue in the past, and it took us a while to figure out what was going on because just like you our process didnt change(meaning our material, staining technique, oven and even the technician working on green state and staining never changed) After doing intensive investigating we found out that our issue was dirty heating elements and the brush that was being used for pre-staining had some old dry stain on the brush which was causing off coloring. Once we started cleaning our heating elements on a regular bases and started using new brushes every few weeks(well now we use pre shaded blanks so no more pre shading) our issue stopped and we started getting our normal results again. So basically it can come down to not the process itself but maybe the tools used for each step. From our experience we noticed that dirty brushes, hands, heating elements, and tools are usually the cause of most mis colors. Also your heating times play an important role because if your hold times or even how fast your temp rises and cools can play a role especially if the furnace is dirty the elements wont heat up properly causing issues with color or even cause cracking. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Zirconium
Zirconia Opaqueness & Shade Issues
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